Here is the full list of all 35 Droid Assault achievements.
Maximum Overdrive buff
Defeated Level 30 Boss
Got Red Alert twice on one level
Got Red Alert status
Achieved security level 6
Defeated Level 20 Boss
Achieved security level 4
Defeated Level 10 Boss
Achieved security level 5
Buffed a droid in every aspect
Achieved security level 3
Achieved security level 2
Command a full squad of 8 droids
Achieved security level 1
Defeated Level 40 Boss
Completed Arcade Missions
Achieved security level 7
Achieved security level 8
Achieved security level 9
Captured the Ultimate Droid
8 droids in ascending security order
Captured 3 9-series robots in same squad
Maximum Recharge buff
Maximum Battery buff
Maximum Armour buff
Maximum Damage buff
Maxed every buff on a droid
Flame, laser, and disruptor resistant droid
Everything-proof and maxed-buffs droid
Escaped with 0 hitpoints and no squad
Fried 100 robots
Crushed 25 robots in doors
Destroyed 100 robots with the disruptor
Defeated a boss with only a Sec Level 1 droid remaining
Started a level with 8 droids, finished with only 1