This is an English guide that will cover all the achievements including the five from The Drowned Past Expansion. Though, it should be fairly easy and simple to get a perfect in one play-through.

"Save often, it's easy to make mistakes."

*This guide should be considered complete.

*I've sorted these out to make it better.

Master of disguise - Disguise
It is so simple, just wear a complete set.


Fancy enough - Wear all pieces of elegant clothes
You can get this early before Peh. There are lots of sources to find elegant clothes.


Burglar - Unlock 10 doors or containers
Self-explanatory, just drill or lock-pick it or use a key to unlock.


Gold rush - Own 1000 auryte
Simple as it sounds, just burgle techno crates, pick people's pockets, whatever. It has to be exactly 1000 auryte you have for this to pop.

Bookworm - Read 10 books
There are some places where you find books to collect and read.


Collector - Own 50 junk items
You'll come across lots of junk sources.


Recycling - Dismantle 20 items for basic components
With the junk you collected, dismantle those on any crafting or alchemical station.


Master blacksmith - Craft 5 items in crafting station
Crafting other basic components even works.


Master alchemist - Craft 5 items in alchemical station
Self-explanatory, make 5 syringes and done.


Through the veins - Use 10 syringes
You can get this in early game. Just use all 10 of the syringes Teriel has or loot or make some and use for later.

Smoke screen - Use smoke grenade
Teriel also has a smoke grenade before Peh. You can also craft, loot, or buy the grenade by chance.

Melt that body - Dissolve 5 bodies
First, craft five dissolvers. Next, hold the interact key on the dead enemy to prompt more choices. Last, inject them to dissolve their remains.

Trapper - Lure opponent into your trap
Simple, place the trap and bait the enemy to trigger it.


Master thief - Perform 10 pickpockets
It's okay to pickpocket someone even they do not have anything interesting. It's also more efficient with the invisibility skill.

Watch your back - Perform 15 backstabs
Self-explanatory, sneak around behind a humanoid enemy and execute. Either way, you can get this earlier before Peh.

Stealth killer - Perform 15 dropkills
A little tricky as long as your target doesn't notice you. Jump from a ledge and execute the enemy from above.

Catlike moves - Perform 20 jumpthrows
This one requires the Acrobatic passive skill. It's best to corner one humanoid and do this until it pops up.

Faster than light - Use Flash Skill
Your first active skill...


Master of time - Use Chronosphere Skill
For later skills, you will get them as you progress the story.


There and back - Use Boomerang Skill
See, it actually works!


Master of matter - Use Blackhole Skill
Target on an enemy to try this out.


New chip new me - Change skill chip
Skill chips are rewarded when completing main or side quests.


Power of gods - Obtain 20 nectars
These sweet canisters are found within the map. Artanak will tell you if you stumble one across nearby. Use sense mode to locate the canister. They are also rewards from side quests.

Improvement - Find 15 skill upgrades
These are littered across Peh, waiting for you to collect them. Simple as that.


Know-how - Find 15 crafting schematics
Same as the skill upgrades.


Tightrope ride - Use zipline 10 times
You will come across these almost everywhere in Peh. Some of these shortcuts are electrocuted, requiring Teriel to hack or use a key card to hitch one.

Traveller - Fast travel 10 times
There is one overseer terminal Teriel will hack to travel to the sanctuary in the story. You can hack the overseers to access the rest of the cargo train branches.

Globetrotter - Hack all Peh's overseers
Does this remind you of Kholat where you fast travel through those little tents? It makes side-quest completing and travelling quicker.

What else I can do? - Complete 40 side quests
You will come across lots of side quests, but the good thing is that you don't have to complete every single one for the achievement. There are some quests that can fail, like Thyra in the Crucible arena for example.

Perfectionist - Finish the game
Pretty much story-related and straight forward. The last main quest to complete is "The Vault".

These five achievements from the free expansion can easily be missed. As you progress the main story, Artanak will notify Teriel about a "visitor" in the sanctuary.

Long time no see - Meet Calithea
She is literally found in the abandoned depot. Approach her to get the achievement, which will also start the expansion's quest-line.

Pyromaniac - Craft a flamethrower
There is a crafting schematic you will stumble along the way. Secondly, it requires parts of the fire-breathing mechanical spiders known as Conservators which they have to be looted before they explode. Alternatively, you can find these parts on one of the scrapped-up piles. Finally, make the flamethrower via crafting station.

Comfy and relaxed - Wear all pieces of spa outfit
There are some places near the gravity pool where the spa wear can be tried on. Just wear each piece of the set and relax on the Rapture-looking resort.

Two drops of water - Use Doppleganger skill
This skill is obtained as you progress the quest-line. Try it out.


The end of ends - Complete Drowned Past questline
Simply complete the "Free Will" quest to finish the expansion. Kinda sounds a little heartbreaking, right?

I was curious on making one and I hope this guide is helpful. Rate the guide if you like it. Any suggestions in the comments are welcomed. Thanks for reading and happy achievement hunting. :)

Credits:
Earl 30 - Making this entire guide
IMGN.PRO and Fool's Theory - Making this ambitious sandbox-like game

[17 May 2020] - Posted
[19 May 2020] - Minor improvements.
[26 August 2020] - Minor improvements and introduced the changelog.