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