Full list of all 24 Family Mysteries: Poisonous Promises achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Capture the main criminal.
Find all Collectibles.
Find all Morphing Items.
Perform all the Evidence analyses.
Collect all Evidence.
Rescue Duke.
Capture the henchmen.
Drive a speedboat.
Finish all the Deduction Scenes.
Complete a Hidden Object Puzzle without a mistake.
Complete a Hidden Object Puzzle without a Hint.
Play through the first hour of the game without skipping any cutscenes.
Perform three Evidence analyses.
Finish your first Deduction Scene.
Complete 5 Minigames without skipping any.
Perform your first Evidence analysis.
Complete a Minigame in less than a minute.
Find one Morphing Item.
Find one Collectible.
Complete a Hidden Object Puzzle in less than a minute.
Finish three Hidden Object Puzzles without a Hint.
Finish three Hidden Object Puzzles in less than ten minutes.
Find three Hidden Objects within three seconds.
Finish all the Minigames without skipping any.