Here is the full list of all 9 The Door in the Basement achievements.
Dropped down through the narrow pit into the caves below
Entered the underground marsh
Escaped the Dollmaker's tunnels
Survived the elevator crash
Escaped your cage after being captured by The Man with no Face
Completed the game
Found and read all of the notes
Found and delivered all of the discarded eyes to Sibyl
Filled out the missing persons board in the safe room