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