Full list of all 27 Layers of Fear achievements. It takes around 12-15 hours to unlock all of the achievements in the base game on Windows.
The base game contains 18 achievements, and there is 1 DLC pack containing 9 achievements.
Collected a rat sketch
Searched 100 drawers and cabinets
Discovered an echo from the past
Found a memento of your family
Took a thousand steps
Got working on your Magnum Opus
Gathered all drawings of rodents
Recalled every word you said
Gathered all family mementos
Completed a painting
Made up your mind
Embraced death for the first time
Gazed at paintings for a total of an hour
Assemble all the puzzle pieces.
Recalled all your childhood memories.
Read every note in the game.