Here is the full list of all 22 ChromaGun achievements.
Rescue the WorkerDroid in Chamber 5-2.
Find the hidden cake we actually have, as opposed to that other game that doesn't have a cake.
Try jumping over a Deadly Electrified Maintenance Tile... and fail horribly.
Solve a chamber in chapter 7 without firing a single shot.
Grill 100 WorkerDroids on Deadly Maintenance Tiles.
Finish Chapter 8.
Finish Chapter 7.
Finish Chapter 6.
Finish Chapter 5.
Finish Chapter 4.
Finish Chapter 3.
Simply walk onto the Deadly Electrified Maintenance tile in Chamber 3-1.
Grill a WorkerDroid on a Deadly Electrified Maintenance Tile.
Finish Chapter 2.
Try jumping... and fail.
Fire 100 shots.
Get killed by a WorkerDroid.
Try painting a brown WokerDroid and realize how pointless that was.
Mix a color. It's not that hard, really.
Finish Chapter 1.
Open a door by activating a trigger.
Shoot a WorkerDroid.