Here is the full list of all 19 Project Graviton achievements.
Skill: Collect 18 chips while in air.
Skill: Stay on a moving platform for 10 seconds on Act 3 Level 2.
Extra: Collect all the chips in the test room
Extra: Play a local multiplayer game
Progress: Aquire 100% in the third act
Progress: Complete the game without using the option "unlock all levels" (Reset game data to try again)
Story: Finish the game (Must complete previous levels)
Story: Reach Act 3, Level 1 (Must complete previous levels)
Progress: Aquire 100% in the second act
Easter Egg: You tried the wrong ways and survived
Story: Reach Act 2, Level 3 (Must complete previous levels)
Easter Egg: You believed!
Skill: Trigger 16 mines (by yourself) one after another and survive.
Progress: Aquire 100% in the first act
Story: Aquire Project Graviton (Must complete previous levels)
Easter Egg: This exit is painful
Story: Make use of Memory Point
Easter Egg: It ain't bloody anymore
Story: Call the elevator (Must complete previous levels)