Here is the full list of all 23 Questerium: Sinister Trinity HD Collector's Edition achievements.
You need to save the city to get this achievement.
You need to unlock all the locked doors to get this achievement.
You need to find all the hidden money to get this achievement.
You need to find all the secrets to get this achievement.
You need to find the Professor Gustav mask to get this achievement.
You need to arrest Gustav to get this achievement.
You need to find the entrance to Gustav's laboratory to get this achievement.
You need to turn off the electricity with a shot from the revolver to get this achievement.
You need to purchase everything in the garden to get this achievement.
You need to deal with all the animals to get this achievement.
You need to find the Mayor Wilson mask to get this achievement.
You need to make 10 purchases in the garden to get this achievement.
You need to neutralize the chemical bomb to get this achievement.
You need to find the Banker Byrd mask to get this achievement.
You need to take the jackpot to get this achievement.
You need to complete one Hidden Object scene without using hints to get this achievement.
You need to make your first purchase in the garden to get this achievement.
You need to complete one mini-game without skipping it to get this achievement.
You need to complete 10 mini-games without skipping them to get this achievement.
You need to complete all mini-games without skipping them to get this achievement.
You need to complete 10 Hidden Object scenes without using hints to get this achievement.
You need to complete all Hidden Object scenes without using hints to get this achievement.
You need to find all the flowers to get this achievement.