No missable achievements (plus 25 unknown)
Sign in with Steam or Xbox to track your progress, and:
Investigated the third library bookshelf.
Touched the hallway mirror.
Banished Mary Chaucer.
Say 'Bloody Mary' 3 times.
Looked in the toy chest.
'Read' Eve Atherton's portrait.
'Read' Edgar Atherton's portrait.
‘Read’ the Aeternam Dagger.
Read’ the metal table.
Answered the Cellar phone.
Look out the hallway window.
Beat the game on Easy.
Read the Ledger.
Defeated Edgar Atherton.
'Read' all of the notes in the game.
Beat the game on Normal.
Discovered the second ending.
Saw Tasha’s ghost in the Kitchen.
Beat the game on Hard.
Do not get killed by a ghost on Easy difficulty.
Beat the game on Nightmare
Do not get caught by a ghost on the Normal difficulty.
Do not get caught by a ghost on the Hard difficulty.
Do not get caught by a ghost on the Nightmare difficulty.
'Read' the Book of Dominion