| Achievement | How to unlock
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|---|
| A Complex Mind (70 points) | Reach all possible conclusions in the game.
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| A Deadly Flower (15 points) | Finish Kew Gardens case.
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| A Man of Character (70 points) | Receive maximum personality ranking.
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| A Methodical Man (70 points) | Gather 26 Character Portraits.
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| An Omnivorous Reader (30 points) | Receive 3 messages from those whom you condemned or absolved.
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| Aye Aye, Captain! (15 points) | Finish Black Peter case.
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| Blood and Ice (15 points) | Finish Blood Bath case.
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| Bruiser (30 points) | Beat Cairns in a fight.
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| Child's Play! (30 points) | Finish 25 mini games and puzzles without skipping.
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| Dog-fancier (30 points) | Interact with Toby in every case.
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| Elementary! (30 points) | Finish 35 mini games and puzzles without skipping.
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| Guilty Brotherhood (15 points) | Finish Half Moon case
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| Haunted House (30 points) | Catch the thieves at Notting Hill Manor.
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| Hold your Herrings, Captain! (30 points) | Save Crocker from committing suicide.
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| I Never Fail (70 points) | Finish 10 Dialogue QTEs without a failure.
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| I Never Guess (70 points) | Reach 6 correct conclusions for all 6 cases.
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| Keen Observer (30 points) | Finish 15 "Character Observations" without skipping.
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| My Grey Matters (70 points) | Finish 45 mini games and puzzles without skipping.
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| Off the Rails! (15 points) | Finish Train case.
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| Perfectionist (130 points) | Collect all possible in-game achievements.
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| Raider of the Tombs (30 points) | Retrieve the Golden Knife from the ancient temple of Mithras.
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| Sharpshooter (30 points) | Disarm Mexican by shooting the gun from his hand.
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| Suicide is Not an Option! (30 points) | Prevent Miss White from suicide.
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| Their crimes, Your punishments (30 points) | Complete the game.
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| Vox populi, vox Dei (15 points) | Finish Abbey Grange case.
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