No missable achievements (plus 25 unknown)
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Finish Black Peter case.
Finish Train case.
Finish 10 Dialogue QTEs without a failure.
Finish 25 mini games and puzzles without skipping.
Finish 15 "Character Observations" without skipping.
Retrieve the Golden Knife from the ancient temple of Mithras.
Finish 35 mini games and puzzles without skipping.
Finish Blood Bath case.
Disarm Mexican by shooting the gun from his hand.
Finish Abbey Grange case.
Receive 3 messages from those whom you condemned or absolved.
Finish 45 mini games and puzzles without skipping.
Finish Kew Gardens case.
Save Crocker from committing suicide.
Complete the game.
Finish Half Moon case.
Catch the thieves at Notting Hill Manor.
Gather 26 Character Portraits.
Prevent Miss White from suicide.
Beat Cairns in a fight.
Reach 6 correct conclusions for all 6 cases.
Interact with Toby in every case.
Receive maximum personality ranking.
Reach all possible conclusions in the game.
Collect all possible in-game achievements.