All achievements can be earned on Story or Normal difficulty modes so pick which ever you prefer to play on.

About half of the achievements are tied to natural story progression whilst the rest are fairly missable. The game is a short replay if you miss anything but if you wanted to follow a guide on first playthrough, you could earn them all in one.

If you see a white circle spinning in the bottom right hand corner, it will often mean that you have performed an action that will result in achievement progression, i.e., and item thrown etc. (You may notice the Steam achievement trackers will increase corresponding to them!)

This section lists all missable achievements that you have limited opportunities to obtain in a playthrough. I have tried to provide a rough order to the obtain-ability of these achievements, although, some can be earned at different stages of a playthrough.

During the Prologue you can pass through a shower room where somebody is naked and taking a shower. Stare at the naked person showering for a short while and the achievement will unlock.

During the Prologue there are a few people that you can talk with to unlock this achievement. You need to talk to the groups of workers in the Cafeteria BEFORE talking to Roy.

The ones outside of story progression are:

• Three tables in the Cafeteria.
  
• And two different group of workers on the deck.

It will unlock after speaking to the last story related interaction if you got all the above.

This achievement can be earnt for listening to the shipping forecast on a radio. There are a few portable radios spread around the game but the place I earnt this is in the Laundry after the event/prologue. It takes a couple of minutes for the shipping forecast to play out.

The first enemy encounter will be in the Laundry shortly after where you can earn the Sailing By achievement. Simply use the leaning mechanic (Q and E on keyboard+mouse or bumpers on controller) to look at the monster and the achievement is yours. Can be earned on any enemy encounter.

When in an stealth encounter with an enemy (like in the Laundry) you can find throwable objects on the ground to act as a distraction. Throw one of these objects into a monster.

When on the main deck with the stealth encounter with a monster (trying to activate lift to helicopter), there will be plenty of objects scattered around that you can throw overboard for this achievement.

This achievement sounds time consuming but when you are first going through engineering to restart the generator you will go through multiple rooms with tens of throwable items per room and no AI monster threat until the return trip!
You can earn the achievement here with minimal effort so you do not need to worry about it going forward. This is also a quick method to obtain it in an earlier part of the game if you missed out on it. Each hiding spot has about 2-3+ items at the openings.

There are many opportunities to drown inside the oil rig and earn this achievement, however, the pontoons (after engineering) are a very easy place to earn this achievement.

When you are looking for Roy's insulin whilst heading to meet him on the roof of the living area, you can find his spoon on his green chair next to his bunk in his cabin - near where the insulin is found. The achievement is unlocked when you look at the spoon.

These achievements are not strictly collectables in the strict sense but require finding/interacting with repeated examples across a whole playthrough.

There are 8 optional phonecalls you must receive in order to unlock this achievement. Steam achievement page shows tracking for this achievement.

Some of the phonecalls happen after you are leaving/left a room so listen carefully for ringing phones and double check rooms with phones after progressing.

• After returning to accommodation after the event, turn right after entering and you will hear the phone ringing.
  
• After putting out your first fire with an extinguisher, open the next door and grab the phone.
  
• In Rennick's office after the chopper, when you go to leave it will ring again.
  
• After entering Admin, the phone will ring in the right office.
  
• In the blue hut while exploring the starboard side of the rigs exterior after the Rennick chase in admin.
  
• After leaving the pontoons, you will call Roy. Got to leave the room and then go back as the phone will ring.
  
• After escaping flooded engineering on your way back to Roy, warm up and then break the lock. The phone behind you will ring when you start walking down to the crew lounge.
  
• After finding Roy and giving him his insulin, head down into the flooded admin area and when you come across a red-lit office the final phone will ring.

There are many bodies of crewmates you can find across the oil rig after the event. The hidden achievement tracker lists 19 bodies. The vast majority of them are on the linear paths needed for progression but they do often need to be inspected to count - button prompt needed. Some are story related.

Approximate list of most easily missed:

• Interact with the body on the deck on the way to the chopper. Have to walk past this body.
  
• Body wrapped in monster goo on deck in blue outfit. Near a hiding spot when avoiding Muir.
  
• Orange outfit after climbing through a vent on the deck.
  
• After entering the pontoons you can find a body on one of the walkway edges atop a ladder before jumping to the suspended red tank.
  
• After your first leg in the pontoons, there is a body in the water you need to swim through.
  
• Behind a locked door after the two bodies from sluice gate. Interact with the door.
  
• In the toilet room through the crew lounge after the flooded engineering section.
  
• A few bodies found in story-related cabins while avoiding Trots.
  
• Right of where Finlay dies.

There are 13 unique electrical interactions according to the hidden Steam achievement tracker that are required for this achievement. It unlocked for me during a story related interaction (rebalancing the oil rig) so below are listed other non-story interactions that are likely required for this achievement.

• Turning on/off a light switch (there are some in the Prologue).
  
• Turning on/off a TV (again one in the Prologue).
  
• Turning on/off a radio (needed for Shipping Forecast achievement anyway).
  
• Turning on/off an electrical heater.

For this achievement you must die to all electrical shock hazards in a playthrough. There are 7 total.
They are as follows:

• In accommodation after the Event and talking to Roy, go around the corner and there will be a hanging light.
  
• On the deck on the way to the chopper, die to the electricity at the bottom of the first two ladders.
  
• On the deck on the way to the chopper, after escaping Muir in the lift, immediately on the left.
  
• In the admin area, after pushing a cart out the way and then clambering over an obstacle.
  
• Can be got after or during the first Rennick chase. Blocking one of the corridor routes. Do not progress too far past it!
  
• While exploring the starboard exterior side of the rig, you will enter an engineering area with water that has an electric current flowing through that you must switch off. Die in it first.
  
• During traversing a now flooded engineering near the end of the game, you will see some sparks from some downed power cables after ascending some climbing sections. Die to this and earn the achievement. Video guide below!

https://www.youtube.com/watch?v=PucCVu49IRY
I do not own this video, credit goes to Shummell Gaming, leave a like!

For this achievement you must die to every single possible source of demise you can meet a single time on one playthrough.

• Drowning (numerous opportunities).
  
• Falling overboard the rig (numerous opportunities).
  
• Fall from a balance section by not gripping.
  
• Fall from a height (numerous opportunities).
  
• Burn to death by fire (numerous opportunities).
  
• Electrical shock (numerous opportunities).
  
• Suffocate in a gas leak (single opportunity after the helicopter crash, while exploring starboard side of the rig).
  
• Die to steam from a leaking pipe.
  
• Touch the gooey material of the monster somewhere on the rig.
  
• Die to each monster once (Trots, Muir, Rennick, Addair, O'Connor).
  
• Die to a monster by failing a quick time event (QTE).

For this achievement you must fall at 5 different points into the ocean off the Oil Rig exterior. Any time you are doing a balance or exploration section on the exterior just fall off once until you get it. It cannot be done in the same area repeatedly.

This achievement is earned for entering every cabin you can in the game inside the crew cabin area. You can enter the following cabins (points of game progression also listed):

Prologue:
• 108 McLeary - Starting cabin.
  
• 107 Campbell - Opposite starting cabin.
  
• 110 O'Connor - During Prologue.
  
• 111 Henderson - During Prologue.
  
• 104 Gibson/Dobbie - During Prologue.
  
• 106 Addair - During Prologue.
  
  Later:
  
• Unlabelled cabin - required for story (body in here too).
  
• Unlabelled cabin #2 - required for story (two bodies in here).
  
• 119 Bannon/Anderson - required for story (another body in here).
  
• Unlabelled (partially flooded) cabin - required for story.
  
• Roy's Cabin - Towards the end of the game looking for his insulin.

For this achievement you must sprint (Shift by default) across all forms of traversal methods (hidden tracker needs 11) across the game. This one is a bit difficult to pin down exact requirements, I would just sprint whenever climbing/traversing environment.

Here is a list of recommendations:

• Up and down ladders.
  
• Up and down stairs.
  
• Across balance beams.
  
• Across both horizontal monkey bars, and vertical climbing.
  
• Shimmying on ledges (both on top and below ledges).
  
• Climbing objects.
  
• Swimming.

These two achievements may require some additional prep work before starting a playthrough if you are to obtain them.

This achievement is unlocked for starting a New Game playthrough with the language set to Scottish Gaelic and finishing the playthrough this way.

Please note that you cannot change the language to Scottish Gaelic at the end of a playthrough to unlock this achievement, it must be selected when you start playing and remain unchanged.

The spoken language will be English but all UI and subtitles will be in Gaelic so I would recommend being familiar with the game first.

The achievement title translates to "The Ocean will bring out its own".

This achievement is a lot easier than it sounds, and many players report earning it without trying - myself included. To ensure you earn it, only sprint during chase sequences or when avoiding the creatures. The rest of the time you can just walk.

All these achievements will be unlocked throughout the story by just simply progressing normally.

















Unlocked after the credits.

Unmissable, you need to use one as part of the story progression.

Simply ascend too high away from the wreckage and die from the bends - you can get this very early in chapter 1.

For this you need to find the crashed helicopter and lifeboat in chapter 1 when exploring the seabed.
The helicopter is found after exiting the first office; head right and through a marine trench (with white tower structure above the trench). Keep going and you will find the helicopter (body also here). Make sure to interact with the front window.
For the lifeboat, head back from the helicopter and past some washing machines. You will find a small sea cave near these, follow it to the lifeboat and interact with the orange life jacket cabinet on the seabed at the rear of the boat.

Some sections allow you to unattach the oxygen umbilical cord, like in Chapter 1, in a side room in admin where the debris pins the cord. Simply run out of oxygen and drown while you are detached and you will unlock this achievement. If you struggle to drown, set the difficulty to Standard and not Story.

This achievement seems to trigger when you die from falling debris/damage from the wrecked oil rig. I got his in Chapter 1, after descending from admin I went through a vent and had to reconnect the oxygen (by bottle memento) and stood still when the debris came crashing down.

Story related and unmissable. Finish Chapter 1.

Find the lighter memento in Chapter 2. It can be found after entering the vents from the first air pocket section of the chapter. Hug the left wall until you enter a larger area where a body will be holding the lighter.

This seems to be story related. Unlocked in Chapter 2 after heading upstairs to the crew cabins in the illusory state of the rig and interacting with the photo within one of the rooms.

Chapter 2. After returning to the real world in the cabins, head through a crawl space and then open a door to a room with a green mop bucket (collectible inside) and keep heading forward, through a narrow gap in the wall. You can then move a trolley to access another cabin, and inside will be a boxing photo which will unlock the achievement.

To unlock this achievement, simply get killed by a creature. The start of chapter 3 works nicely.

Story related and unmissable. After escaping the monster and passing out at the start of chapter 3.

Story related and unmissable. Unlocked not long after the above.

Unlocked for ending the game by letting go of Brodie during the end of Chapter 3.
Unlocked for ending the game by NOT letting go of Brodie, do nothing, during the end of Chapter 3.

Unlocked for beating the DLC with the language set to Scottish Gaelic (Gaidhlig (An Rìoghachd Aonaichte)).

These achievements are awarded for finding human remains in the Siren's Rest DLC. You get an achievement for finding 1, 7, and 13 human remains.
Although the first achievement unlocks for spotting the body, I would take photos of each just in case!
Locations:

• Chapter 1. Virtually unmissable. Blue suit with some fishes swimming around it after exiting the office.
  
  
• Chapter 1. Head right out of the first office through a marine trench and you will find the helicopter and a burnt body here.
  
  
• Chapter 1. After entering the admin building you can cut open a high up vent in a side room to access a vent shaft. Keep going until you reach the final room and you can find a 'coral' covered body in here.
  
  
• Chapter 1. In a red suit, found after swimming through a vent (by the heater) from the break room area within admin. This is also a memento, pick up his helmet as well as taking the photo.
  
  
• Chapter 1. After some falling debris lands on your umbilical cord and blocks backtracking after descending deeper down into admin, you can enter Health and Safety on the left. Enter and burn through a vent grid to find the body in the next room.
  
• Immediately after the previous body, cut the yellow beams next to the body and descend into the room below. You will find another body here.
  
  
• Chapter 1. While exploring on foot (leaving the swimming for now), you will need to push down a cabinet to create a hole in the floor. Make sure BEFORE you fall into the hole you jump across to the other side of the room to find a body here. If you fall, reload latest checkpoint.
  
  
• Chapter 1. While exploring on foot (leaving the swimming for now), keep going until you find a room with this 'coral' covered body. Practically unmissable, just remember to photograph it.
  
  
• Chapter 2. After entering engineering (Mud Pits) you will enter a large room. Head up into a roof cavity and through a vent. Here you will find a body at the exit of the vent.
  
  
• Chapter 2. After exiting the water into an air pocket, open the door across some monkey bars and follow it round. You will find a body in a blue suit here.
  
  
• Chapter 2. Hug the left wall when entering the prolonged vent section (were you cut through grills) until you reach a large vent space with a body behind a grill.
  
  
• Chapter 2. While exploring with flares for the first time, don't enter the pipe. Instead head right into the open area and head to the back. The coral here has body parts in it so take a photo.
  
  
• Chapter 2. When you come to the pushing cart in the knee high water, don't push it. Instead climb it and into a hole in the ceiling directly above. There is a body in a diving suit in front of you that vanishes when you take the photo.

These achievements are awarded for finding mementos in the Siren's Rest DLC. You get an achievement for finding 1, 9, and 18 human remains.
Locations:

• Chapter 1. In the first office drawer. (Photo).
  
  
• Chapter 1. In the gas flare hut. Use the crowbar to enter the gas flare hut on the seabed floor, near admin. Then open the locker inside, the Hindu Idol collectible is inside.
  
  
• Chapter 1. Head into admin after collecting the cutting arc. Cut open the floor vent into a side room. The Crucifix Cross is up on the wall opposite.
  
  
• Chapter 1. In a break room off the admin corridor, you can swim under a broken door into a store cupboard. Open the counter with a crowbar and you will find a white and blue mug.
  
  
• Chapter 1. A helmet (Scooby) on top of a red suited body found after swimming through a vent (by the heater) from the break room area within admin. This is also a body, don't forget to take the photo.
  
  
• Chapter 1. After the rig collapses on your umbilical heading deeper down into the rig, you can enter a door immediately. Enter and on the right push the filing cabinet onto a weak floor to do 'some minor demolition'. There will be a cabinet with a cassette tape label.
  
  
• Chapter 1. Head onwards from the previous collectible. Hug the left hand wall continuing on and you will find some sneaky red/brown pipes that can be cut through to create a new direction. Keep heading this way and through a vent that traps your umbilical cord. Here you will find the bottle memento in a filing cabinet. You can also get the 'Wrecked' achievement here.
  
  
• Chapter 1. While exploring on foot (leaving the swimming for now), you will need to push down a cabinet to create a hole in the floor. Make sure BEFORE you fall into the hole you jump across to the other side of the room to find a ID badge. If you fall, reload latest checkpoint.
  
  
• Chapter 1. Unmissable. Datalogger.
  
  
• Chapter 2. While exploring the deeper wreck, head to where the gas is flowing out (need to divert for story) but instead of pushing the crate, head a bit further and into a door opening on the deck. You will find a red flask in here.
  
  
• Chapter 2. In the orange container (near accommodation centre while swimming around the wreck) you can open a locker inside with some keys on the top shelf.
  
  
• Chapter 2. On top of the sunken yellow crane there is a yellow bar with some debris that you can push out the way to reveal an insulin case. This is very near the upper limit where you die so be careful not to ascend to high.
  
  
• Chapter 2. In the mud pits/engineering, cut open the door with the blue panel on it that you need for the story. In this half of the room is a large ceiling pipe you can enter. Inside you will find a tin of darts.
  
  
• Chapter 2. After exiting the water into an air pocket, do the monkey bars and open a door and follow the corridor round. It is in a locker next to the body here (another photo).
  
  
• Chapter 2. Hug the left wall when entering the prolonged vent section (were you cut through grills) until you reach a large vent space with a body holding the lighter. This will grant the achievement "Christ, I Need a Smoke".
  
  
• Chapter 2. Story related picture in illusory crew cabin.
  
  
• Chapter 2. After entering the real crew cabins, exit the cabin through a crawl tunnel and open a door in the following area. There will be a journal book in a green mop bucket here.
  
• Chapter 2. Keep heading forward from the above, through a narrow gap in the wall. You can then move a trolley to access another cabin, inside will be a boxing photo. This will also unlock the achievement "Won't Wait Forever".

There are 7 areas of interest to find. These are usually accompanied by a voice line. Watch for the saving icon as this usually indicates progress. This all takes place in Chapter 1 BEFORE entering admin.

• The crashed helicopter. As mentioned elsewhere in the guide, head right out of the first office through a marine trench and it will be located at the far end by a deep hole. Needed for 'Lost with All Hands'
  
  
• Broken Pipe. On route to the helicopter, in the trench you can find a broken pipe. Swim through to find a few items here.
  
  
• The Washing Machines. Located near the first office, before the marine trench described above.
  
  
• The Lifeboat. As mentioned elsewhere, head into a cave near the washing machines above and you will locate the life boat in a hole. Needed for 'Lost with All Hands'
  
  
• Random Junk. To the left of the first office you leave, you can enter a white pipe structure. On the sea bed inside is a calculator and a lamp etc. Interact and this will count.
  
  
• Gas Flare Hut. Use your crowbar to gain access. It is adjacent to the admin entrance where the red flares terminate. Hindu Idol collectible inside.
  
  
• Portacabin 'Coral'. You need to grab the cutting arc by the entrance to admin (follow red flares) to open the door to the portacabin (located near the above pipe in a ditch). Grab it and back track here before continuing. Cut open the trap door (go underneath at rear) and enter to find the 'coral' structure.

There are 14 to find. These are usually accompanied by a voice line. Watch for the saving icon as this usually indicates progress. This all takes place in Chapter 2 BEFORE entering engineering.

• Deeper Trench. Immediately follow the new trench right and they will comment on the deeper section.
  
  
• Cabin. Swim through a broken window into the cabin directly below where you start the chapter.
  
  
• Cooling Stacks. You need to click to interact while looking at the cooling stacks near the start, far side.
  
  
• Junkyard. Swim around the pipes and bits on the left side.
  
  
• Boot in Rusted Shaft. Enter one of the rusted shafts on the left side and swim down to find a boot.
  
  
• "Door" x3. Look at the red corrugated metal on the bottom of the seabed and find a couple of 'door' openings. Each counts separately. The third is further along, past the gas flowing out the pipe.
  
  
• Rusted Shaft 2. Keep exploring different rusted shafts until the characters comment on it.
  
  
• Diving Deck. Swim through the large rusted structure towards the way to progress, just off to the left.
  
  
• Accommodation Module. Swim to the back of the wreck to find the exterior of the accommodation module. This will trigger some dialogue to count.
  
  
• Orange Container. Just find the orange container near the accommodation module.
  
  
• Auxiliary Exit. At the bottom of the Diving Deck. Easy to miss. Look for a door in the floor (notice the trend).
  
  
• Push the blue box to destroy the gas pipe and continue.