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