• Total Achievements: 47
  
• Estimated Difficulty: 7/10
  
• Estimated Time: 25h+
  
• Dificult Influence: No, you can do everything while playing on easy
  
• Playthroughs: at least 2 (for Arcane Collector)
  
• Missable achievements:
  
  • By Mistake (can be get in the next playthrough): Top Salesman, August's Adventure, Skeptic, Most Correct Choice, Mysterious Pen Pal, Detective Leila, Miner Savior
    
  • By Bug (need to begin a new game from zero): Home Sweet Home, I'm RICH

All achievements in this section you get while playing the game

01) I want to be a Vigilant!
Welcome to the world of Vigil: The Longest Night!
Just begin the game, you'll get this one


02) Night Hunter
Defeat the Craving Terror outside the town
Beat the Craving Terror, the 1st boss of the game


03) Bruna's Redemption
Defeat Brood Mother
Beat the Brood Mother at the Secret Cave


04) Complete the Vigil Trial
Defeat the Ancient Guard once
Beat the Ancient Guard for the first time


05) The Tide Rider
Defeat Kelpie, the Lord of Tide
Defeat Kelpie, the Lord of Tide at the Flooded Area


06) Flames Doom
Defeat Erupting Flesh Cluster
Defeat Erupting Flesh Cluster in the Mines


07) Her Last Supper
Defeat Lord of the Misty Lake
Beat the Lord of the Misty Lake at Bufonitte Lake


08) Broken Wings
Stop the crazy Doctor
Beat the Doctor in the last part of the game


09) Light of Doom
Defeat Light Devourer
Beat Light Devourer, the last boos of the game

All achivements in this section are unlocked while doing spectics side-quests

10) Mysterious Pen Pal
Complete Duran's quest
Complete the side quest "Glorioust Guard"
See "August's Adventure" for this one


11) Detective Leila
Help Thurber W. Sungi's investigation
Complete the side quest "Royal Detective"
See the following video that explain how to do it:



12) No Salt Babe
Help James to find the salt
Complete the side quest "Shortage of Salt"
See the following video that explain how to do it:



13) August's Adventure
Help August during his adventure
Complete the side quest "Descendet of the Guard". Since you need to complete the side quest "Glorioust Guard" to trigger this one, see the following video with both:



14) Running Around
Help Daisy to get the medicine
Complete the side quest "Daisy Special"
See the following video that explain how to do it:



15) Miner Savior
Save all miners then talk to Edward
Complete the side quest "Rescue The Survivors"
See the following video that explain who to do it:



16) Connoisseur
Collect all 7 lost paintings
Complete the side quest "Happy Accident"
Since this one is needed to do the "Sisters End", see the section "Sisters End"


17) Golden Dream
Find the Golden Slime
Complete the side quest "Gold Rush"
See the following video that explain who to do it:



18) Across the Sea
Complete Noax's request
Complete the side quest "Draft in a Bottle"
See the following video that explain how to do it:



19) All Alone
Complete the Mysterious Trader's request
Complete the side quest "Monazite"
See the following video that explain how to do it:



20) Secret of Church
Pass Sister Holly's test
Complete the side quest "Serve The Church".

To trigger this quest, you need to advance until some point of the side quest "Ancient Seal", so see the video from "Skeptic" achievement, which shows from which point you can begin this quest.

WARNING: Found out, at least in PORTUGUESE-BR, that some questions made by Holly are bugged. I did send a message to the devs, but just to be sure, when you go to answer her questions, put in english to avoid giving the right answer and getting it wrong XD

See the following video that explain who to do it:



21) Eyes on You
Get the Fallen Eyeball from Hilda
Part of Hilda's quest.
See "Skeptic" for this one.


22) Skeptic
Followed Hilda's words to relieve the seal
Complete the side quest "Ancient Seal". While working this achievement, "Eye on You" will be unlocked.
See the following video that explain how to do it:



23) Let's Play!
Give Isabella the ball
Complete the side quests "Daisy's Special" & "Recovery"
Since this one is needed to do the "Sisters End", see the section "Sisters End"


24) Lost Fortune
Find Hamilton's belongings
Complete the side quest "Hamilton's Jewelry".
See the following video that explain who to do it:


25) Top Salesman
Distribute the placebos to the Villagers in town
Complete the side quest "Placebos".

To trigger this quest, you need to advance until some point of the side quest "Ancient Seal", so see the video from "Skeptic" achievement, which shows from which point you can begin this quest
See the following video that explain who to do it:

This section show all achievements that requires to beat some boss that AREN'T needed beating to finish the game

26) Storm in Otherworld
Defeat Uptancos
Beat Uptancos at Shadow Disaster
Since this one is needed to do the "Sisters End", see the section "Sisters End"


27) Sealed with Hatred
Defeat The North Princess
Beat The North Princess at The Frozen Realm
Since this one is needed to do the "Sisters End", see the section "Sisters End"


28) The First One
Defeat Dephil
Beat Dephil at Everlasting Cage.
Since this one is needed to do the "Sisters End", see the section "Sisters End"

This section is for achievements that require some specifics actions that can be missed at some point or simpling doing some random things.

29) Most Correct Choice
Give the Cubic Crystals to the Doctor
After getting the 3 cubic crystals, give them to the Doctor when he ask for ir.


30) Sealed Disaster
Defeat the Evil inside the wood
Do NOT give the 3 cubic crystals to the Doctor and use them at the Giantwood.


31) Beg from Beggar
Beg to Drew 5 times
For this one, you need to interact 5 times with Drew, the beggar near the Asylum while having less than 10 gold, he will give you 5 gold.

Note: for this, you don't need to kill a boss for each time you need to BEG for money.
While you don't give he money and talk to him having less than 10 golds, he'll always give you money, so get money, spend it and go back for more until you get the achievement ("STONKS UP" XD)

Thanks for @Killerofangel for the help in this topic:
https://steamhost.cn/steamcommunity_com/app/720560/discussions/0/3010053344553368633/

32) Glass Hearted
Don't shake it anymore!
See "Home Sweer Home" in the "Collection Achievements" for this one


33) I'm RICH
Buy Buffe's house
Just pay 10k gold to Buffe after he appear at Maye. He appear after beating Kelpie.
Required to unlock the achievement "Home Sweet Home"

This section aproachs all achievements that requires leveling up Leila.

34) Sword Master
Complete the sword skill tree
Just unlock all skills for sword fight


35) SMASH!
Complete the axe skill tree
Just unlock all skills for "axe" fight


36) Faster and Faster
Complete the dual weapon skill tree
Just unlock all skills for dual blade fight


37) It's all about Practice.
Complete the bow skill tree
Just unlock all skills for bow fight


38) Survival expert
Complete the survival skill tree
Just unlock all skills for Leila's general survival


39) I Want Them All.
Complete all skill trees
Unlock all skills, need to reach level 161 to do it.

A good location to grid is in the area near the save point "Insideous Sewer". There's 2 rolling monster there and at NG+ together with "Stray Ring" each one give 3744 exp.
It's possible to beat both in less than 30 seconds, time needed to active "Owl's Feather", fast traveling the the save point and respaw both.

40) Acrobat
Reach maximum value of Throwing power
This one is kinda buggy. The better to do it at NG+.

Do this:

• Find the Skill Master near the "Cat Island" save point (at Depresing Forest);
  
• Save before doing the other steps;
  
• Choose the first option to reset all your skill points;
  
• In a NG+, you can use skill point to upgrade your stats, so put 99 at "throwing";
  
• It SHOULD unlock the acheivement now, but it doesn't, so now use some more skill points to upgrade Leila's general skill tree and when confirming it, the achievement is unlocked

41) Great Arcanist
Reach maximum value of Arcane power
This one is kinda buggy. The better to do it at NG+.

Do this:

• Find the Skill Master near the "Cat Island" save point (at Depresing Forest);
  
• Save before doing the other steps;
  
• Choose the first option to reset all your skill points;
  
• In a NG+, you can use skill point to upgrade your stats, so put 99 at "arcane";
  
• It SHOULD unlock the acheivement now, but it doesn't, so now use some more skill points to upgrade Leila's general skill tree and when confirming it, the achievement is unlocked

This section cover all achievements that requires collecting items all around the game.

42) Arcane Collector
Collect all arcane items
Well, you need to get EVERY SINGLE ARCANE ITEM in the game, which can be quite hard, since you can't get every one in a single play, so you need to do a NG+ run.

See the following video that explain how to do it:


43) Weapon Collector
Get at least one of every weapon in game
Well, you need to get EVERY SINGLE WEAPON in the game, which can be quite hard.
See the following video that explain how to do it:



44) Cloth Collector
Get at least one of every equipment in game (including rings)
Well, you need to get EVERY SINGLE ARMOR AND RING in the game, which can be quite hard.

UPDATE:
In the update from 11/11/20, they add the "Vigilant's set" for sale at the Blacksmith in the first part of the game, so if you sold yours, you still can get them again at the NG+
Thanks for youtube user "Neiluj" for the hint.

Print from the blacksmith:


See the following video that explain how to do it:



45) Home Sweet Home
Collect all furniture
Need to buy Buffe's house, collect all furniture from the game AND putting them in the house.

UPDATE:
The update from 11/11/20 corrected the bug that prevented Buffe appear in a NG+, so now if you did buy the house in your 1st run, after beating Kelpie, the house is already yours, just enter there and all furniture that you used in the house will already be there.
Thanks for youtube user "Neiluj" for the hint

See the following video that explain how to do it:


46) Craftsman's Persistence
Forge 5 weapon/equipment enchanted and reach to +7
Need to hold 5 pieces of equipment that had reach +7 using forge. Can be done at NG+

47) By the Will of Dephil
Wake Daisy's soul inside the Devourer
Reach the "Sisters Ending", which requires varios actions and side-quest to do it.

While working this ending you will unlock the following achivevements:

• Connoisseur;
  
• Eyes on You - this one you can see it in the video below or while following the video for the achievement "Skeptic";
  
• Storm in Otherworld;
  
• Sealed with Hatred;
  
• The First One;
  
• Let's Play!;

Follow the video below that describes step by step how to do it: