Here is the full list of all 20 New York Mysteries: Secrets of the Mafia achievements.
Completed the spot the difference mini-game without making a mistake.
Completed the symbol plates mini-game without excess clicks.
Completed the main and bonus chapters without skipping mini-games.
Completed the main and bonus chapters without using hints in hidden object scenes.
Completed the main and bonus chapters without skipping dialogs or movies.
Completed the main chapter on Hard mode.
Collected all the phantom objects.
Completed all collections.
Completed the statue of liberty collection.
Completed the casino chip collection.
Completed the tie collection.
Arranged the books showing the presidents' portraits in chronological order.
Completed the briefcase collection.
Completed a mini-game in more than 5 minutes.
Completed a trip in the underground city.
Completed 3 mini-games in a row without using the Skip button.
Completed a hidden object scene without random clicks.
Found 3 items in 3 seconds in a hidden object scene.
Completed a mini-game in less than a minute.
Clicked more than three times in one second in a hidden object scene.