Overview
Complete guide for getting all achievements in game
Important notes
☬ This guide divided into chapters 1-14 by the number of chapters in game;
☬ At the end of each section you can see what collectible items each chapter contains;
☬ To gain some achievements you need to correctly increase skills like: Spot hidden, Occultism, Investigation;
☬ To choose R’lyeh responds you should decrease level of Pierce’s sanity by turning him into bad situations. This guide also contains section “What affect sanity”, if you think you forgot to do something;
☬ Doing such a big guide was hard work, so if you notice I wrote something wrong — please, write it in comments. Also, if you want to help me and my work, I really appreciate any help, like screenshots, videos, text explanation, etc.
I also really appreciate when you give “likes” and add this guide to favourite, thank you all!
Endings
Nameless Cults
Refuse to take part in the ritual
★ Suicide ending. To obtain this ending, I did:
✔ drink no alcohol
✔ read all unholy books
✔ tell Bradley truth
✔ always choose R’lyeh whenever I could
✔ make Mrs. Sanders commit suicide
✔ accept Drake’s help
✔ save Drake (I think it doesn’t matter for this ending, but still)
✔ accepted Leviathan’s knowledge, tried to breath, accepted to drink medicine, but refused to eat flesh and kill Dr. Fuller
✔ give medkit to Cat instead of Mitchell and examine Mitchell’s body
✔ kill Bradley
Successfully carry out the counter ritual
★ Counter ritual enging. To obtain this ending, I did:
✔ drink no alcohol
✔ accept Drake’s help
✔ read all unholy books
✔ always choose R’lyeh whenever I could
✔ kill Bradley
✔ save Drake (It’s important, cause you can’t obtain this achievement without him)
✔ accepted Leviathan’s knowledge, tried to breath, accepted to drink medicine, but refused to eat flesh and kill Dr. Fuller
Invoke Cthulhu. I think it’s default ending and you can get it whatever choices you made.
Refuse to all you can
★ Sara’s suicide enging. To obtain this ending, I did:
✔ drink alco (I think it doesn’t matter, still)
✔ read all unholy books
✔ don’t choose answers with R’lyeh language
✔ accept Drake’s help + saved Drake
✔ refuse to accept Leviathan’s knowledge
✔ refuse to drink medicine, refuse to eat Leviathan’s flesh, refuse to take the gun, etc
✔ spare Bradley
Easy missed achievements
The most trivial object
Discover all the small blue bottles
Piece together Margaret Wyckwood’s memories
Discover all the murals of the disappeared tribe
Find occult items
Choose all the replies in R’lyehian
IMPORTANT: You need to choose default ending (invoke Chulthu)
Read all the books of unholy knowledge
Reach the level of Expert in a skill
Never drink alcohol
Find 20 hidden items
★ To do that, you need to increase your Spot Hidden skill as soon as possible. Hidden objects have green light, so you probably won’t miss it. And if you go to the location with hidden objects, you can see circle in left down corner. When you find all hidden objects in this area, there would appear check mark in circle.
If you’re stuck, I recommend to watch this video below:
Thanks to DTR for noticing!
Inspect 50 items
What affects sanity
Chapter 1
The Sarah Hawkins case Accept the Sarah Hawkins case
Collectibles:
Pierce’s office
1 pills, 1 occult item
Chapter 2
Ex Oblivione Fail a skill test ★ You can do this when you arrive in Blackwater Island. Go to the dead whale and examine it.
Be the plaything of an hallucination
Deliver liquor to the sailors
★ These two achievements you can get when you need to enter warehouse no. 36.
At first you need to have 4 points in Strength. To earn achievement for alcohol you should: At first, apologize to Mitchell, when you first appear in tavern. Then you need to talk with sailors and ask them to do you a favor (return to tavern and buy them a whiskey). Then enter the warehouse, watch cutscene and go back to tavern, but don’t go in — you need to turn left and enter place with trapdoor. To earn second achievement, you need to find three items and take them in correct order (cog, ratchet, lever). After solving this puzzle, go further, you’ll get the second achievement.
Collectibles:
“The stranded whale” bar
Pier
Secret passage to warehouse no. 36 (where you see hallucination)
Warehouse no. 36
2 occult items, 1 pills, 1 drawing on the wall
Chapter 3
The Strange High House Get driven to the Hawkins MansionThe Terrible Old Man Convince the caretaker to help youMemory Explore the memories of the Hawkins familyThe Secret Cave Discover the mansion’s secret passage A brilliant mind Use the globe to open the secret passage ★ If you look at the bookcase, to the right you can see a globe. Put right coordinates and use it. 
Collectibles:
Simon’s room
1 pills, 1 occult item
Chapter 4
The pit of horror Fall into the sacrificial pitThe Temple Take part in the ritual in the caves
Collectibles:
Near pit
When you enter cave
5 occult item, 1 diary, 5 drawings of walls
Chapter 5
The aficionado of horror Meet Francis SandersSandman Make a deal with a crazed inmate ★ First step: find crazy guy. 
★ Second step: get the pills. 
Collectibles:
1 pills, 1 occult item
Chapter 6
From Beyond Banish the Dimensional Shambler The Thing on the Doorstep Banish the Dimensional Shambler using only one dagger ★ You can find behind the picture of Shambler small piece of paper with drawing of dagger. That dagger can be found in far right corner of the room, if the canvas is behind you. 
Shared guilt Push Irene Sanders to the limit ★ At first, when you appear in Sanders’ manor, talk with Irene and say that she put her husband in hospital, so she’s the one who’s guilty. When listen to her husband recording. Examine the Irene’s body in hospital, when you play as doctor. Achievement will pop in near end game, when Pierce is in prison. 
Strange secrets Find occult items
Collectibles:
Sanders’ manor
1 diary, 1 pills, 1 unholy book, 4 occult item
Chapter 7
Scholar of the unspeakable Meet Algernon Drake and accept his helpThe Book Read the Necronomicon
Collectibles:
Drake’s shop
1 diary, 1 pills, 1 unholy book + Necronomicon (STORY RELATED!)
Chapter 8
Caught in the trap Fall into Fuller’s trapHippocratic Oath Heal all the patients ★ When you play as doctor, talk to all people you can in hospital. Also you need to talk with two brothers, whom you can find if you go out opposite the fireplace. 
The White Ship Learn the secret of the Scylla ★ You can find Scylla puzzle when you’ll play as doctor (I rly forgot her surname, sorry). When you enter Dr. Fuller’s office, you can find small model of this ship. All you need is to put all sails in right direction. 
Chapter 9
The curse of Sarah Find Sarah HawkinsThe amulet of the Ancients Lay your hands on Algernon Drake’s treasure The most trivial object Discover all the small blue bottles Complete revelation Read all the books of unholy knowledge
Collectibles:
Dr. Fuller’s office
1 diary, 1 pills, 1 unholy book, 5 R’lyeh options
Chapter 10
Shared guilt Push Irene Sanders to the limit ★ At first, when you appear in Sanders’ manor, talk with Irene and say that she put her husband in hospital, so she’s the one who’s guilty. When listen to her husband recording. Examine the Irene’s body in hospital, when you play as doctor. Achievement will pop in near end game, when Pierce is in prison. The voice beyond the grave Chat with a visionThe Outsider Banish the creature for good Companion in arms Save Drake’s life during the fight with the creature ★ You need to use your lamp on Shambler when it caught Drake.Chapter 11
The Rats in the Walls Make the suspects talk by using a heavy hand ★ When you play as Cat, hit one of the men.Chapter 12
In the footsteps of Daniel Upton Kill or spare BradleyThe Abomination of Darkwater Kill 5 inhabitants who are being controlled ★ When you escape prison, kill 5 people. The Good Samaritan Save Mitchell ★ When all goes to Hell and you finally escape the prison, you can find a medkit at warehouse. Bring it to Mitchell, he’s near pier with statue. Give him medkit and achievement will pop.Chapter 13
The Beast in the Cave Enter the beast’s denVoyage into history Open the sailor’s chest in the whaling station ★ You can find it in room in the whaling station, after hallucination turn back. 
Detective historian Piece together Margaret Wyckwood’s memories
Collectibles:
1 diary
Chapter 14
Fluent in R’lyehian Choose all the replies in R’lyehian IMPORTANT: You need to choose default ending (invoke Chulthu) 
The Shadow Out of Time Discover all the murals of the disappeared tribe
Collectibles:
1 drawing on the wall
