Here is the full list of all 12 Dark Room achievements.
Listen to the end credits music
Unlock the third ending of the game !
Find all letters in the game
Start the top secret mod
Unlock the second ending of the game !
Start the green stone mod
Unlock the first ending of the game !
Find the exit door password
Find the computer password
Solve the first puzzle in the game
Unlock the first door in the game
Start the purgatory mod