Full list of all 27 Layers of Fear achievements. It takes around 10-12 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.
Completed a painting
Gazed at paintings for a total of an hour
Gathered all family mementos
Recalled every word you said
Gathered all drawings of rodents
Made up your mind
Embraced death for the first time
Searched 100 drawers and cabinets
Took a thousand steps
Collected a rat sketch
Discovered an echo from the past
Found a memento of your family
Got working on your Magnum Opus
Assemble all the puzzle pieces.
Recalled all your childhood memories.
Read every note in the game.