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