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