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