| Achievement | How to unlock
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| Achievementologist | Complete all other achievements.
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| Arsene Lupin | Solve three Lockpick puzzles in less than one minute.
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| Avid Reader | Read three newspapers.
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| Cat Lady | Play with Breebo.
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| Clue Collector | Find all nine
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| Clue Finder | Find three Clues connected to your investigation.
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| Clue Master | Find all Clues connected to your investigation.
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| Clue Seeker | Find five Clues connected to your investigation.
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| Dick Tracy | Complete all the Detective Mode scenes.
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| Freshman | Complete your first Detective Mode.
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| It's Something | Finish your first Hidden-Object Puzzle.
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| Last Stand | Save yourself.
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| Puzzle Addict | Solve five Puzzles without using the Skip button.
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| Puzzle Master | Solve all Puzzles without using the Skip button.
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| Puzzle Solver | Solve a Puzzle without using the Skip button.
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| Scrupulous | Gather information on all of the characters.
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| Shoo! | Get rid of Breebo for good.
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| Show Me More | Watch the cutscene in the museum.
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| Unaided | Complete three Hidden-Object Puzzles without using the Hint button.
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