Here is the full list of all 29 Assault Android Cactus achievements.
Complete Boss Rush mode
Finish any level without taking damage
Reach a chain of 1000
Collect every Battery dropped in the Collider level
Reach layer 25 in Infinity Drive mode
Defeat one of Embryo's phases before he can relocate
Destroy every laser fence In Justice's first phase
Destroy an enemy with Helo while it's caught by a Singularity
Drop a cannonball down the hole in Filament
Play as 8 Androids
Destroy 15,000 homicidal robots
Earn an S+ rank on any level
Rescue the Genki Star
Cause 3 mines to explode in succession without being shot
Unlock all items in the Art Gallery
Destroy 3 enemies by driving another enemy through them with the Giga Drill
Defeat Superstructure Engineer Venom
Destroy seven enemies with a single Rail Gun shot
Defeat Security Administrator Justice
Unlock all items in the Codex
Reach Layer 15 in Infinity Drive mode
Defeat Hydroponics Controller Vespula
Activate an EX Option
Unlock any item that costs credits
Defeat Production Overlord Embryo
Reach a chain of 100
Lead the laser turret to defeat Medulla
Earn an S+ ranking on all campaign levels
Unlock all items in EX Options