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