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