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