Here is the full list of all 22 Contrast achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Unlocked after the player discovers all collectibles in Act III.
Unlocked when the player discovers all collectibles in Act II.
Unlocked after the player discovers all collectibles in Act I.
Unlocked when the player jumps into the treasure chest in the Pirate Ride.
Unlocked when the player tries to enter the XXX door.
Unlocks when the player completes the game.
Unlocked when the player completes the Lighthouse.
Unlocked when the player completes the Workshop.
Unlocked when the player makes it over the crocodiles on their first attempt in the Shadow Theater.
Unlocked when the player finds the Cyclops' bottle in the Carousel area.
Unlocked when the player repairs the three attractions.
Unlocked when the player examines Didi's family pictures.
Unlocked when the player goes through the circus tent toward the attractions.
Unlocked when the player completes Act I.
Unlocked when the player leaves the Cinema.
Unlocked when the player lets the gangsters beat up Johnny.
Unlocked when the player clears the Void Jump on their first attempt.
Unlocked when the player falls into the void on the way to the Cinema.
Unlocked when the player leaves the Cabaret.
Unlocked when the player finds the hidden Extra Life 2012 Logo.
Unlocked after the player gets their second luminary.
Unlocked when the player shifts for the first time.