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.
Finish three Hidden Object Puzzles in less than ten minutes.
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.
Finish three Hidden Object Puzzles without a Hint.
Perform your first Evidence analysis.
Complete a Minigame in less than a minute.
Complete a Hidden Object Puzzle without a Hint.
Find three Hidden Objects within three seconds.
Find one Morphing Item.
Find one Collectible.
Complete a Hidden Object Puzzle in less than a minute.
Finish all the Minigames without skipping any.