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