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