Here is the full list of all 67 Ultratron achievements.
Maximum shields
Laser pet levelled up to maximum
Shooty pet levelled up to maximum
EMP shocked 50 enemies in one blast
EMP shocked 25 enemies in one blast
EMP shocked 10 enemies in one blast
Grenade add-on upgrades maxed
Upgraded all pets to maximum parameters
Vanquished 10000 enemies
Detonated 25 smartbombs in a single game
Rocket pet levelled up to maximum
Maximum droid power
Killed 1000 enemies with grenades
Beat a level without firing a single shot
Upgraded rocket pet to maximum
Vanquished 5000 enemies
Drone survived 20 levels
Drone survived 10 levels
Single drone shot down 100 enemy bullets
Maximum drone upgrades
Detonated 10 bombfruits
Defeated two bosses
Collected 50 fruits
Killed 500 enemies with grenades
Quantum-shifted through a boss
Upgraded laser pet to maximum
Upgraded shooty pet to maximum
Maximum dot slurp range
Defeated Letum
Full complement of smartbombs
Defeated Lues
Killed 100 enemies with grenades
20 kills with a single grenade
Player has fired 10000 shots in a game
10 kills with a single grenade
Got 100% on a dodge stage
Vanquished 2500 enemies
Collected 25 fruits
Smartbombed 10 enemies with one blast
Smartbombed 25 enemies with one blast
Defeated Bellum
Single drone vanquished 250 enemies
Held one or more pets for 10 levels without dropping
Collected 1000 dots
Consumed 10 consecutive fruits
Collected 10 fruits
Held one or more pets for 5 levels without dropping
Defeated Ieiunitas
Vanquished 1000 enemies
Got 100% on a challenge stage
Collected 500 dots
Player has fired 1000 shots in a game
Vanquished 500 enemies
Survived assault level without taking damage
Maximum score multiplier
Collected 250 dots
Collected 100 dots
Vanquished 100 enemies
Awesome double three way bouncy gun
30 kills with a single grenade
Drone survived 30 levels
Double three way bouncy bezerk gun
Double three way bouncy max power rapid fire gun
Player has fired 100000 shots in a game
Smartbombed 50 enemies with one blast
Maxed turbo power and recharge
Held one or more pets for 20 levels without dropping