Here is the full list of all 13 Decoherence achievements.
Succesfully complete all stages of the game's tutorial.
Beat Alpha.Care in Entropy.
Beat Sismik.0 in Entropy.
Beat Dragon(0)Raider in Entropy
Complete a full Entropy trial with Tadashi.
Complete a full Entropy trial with Sabrina.
Complete a full Entropy trial with Sam.
Complete a full Entropy trial with a.Drone(Ai).
Play a multiplayer match.
Play a match against a friend.
Win 5 multiplayer matches.
Create a Squad in the Squad Editor.
Beat Bitl.Saws in Entropy Mode.