Here is the full list of all 21 SpaceFuss achievements.
Complete story mode
Kill evil cat
Slow down time 25 times
Destroy 1000 Robots
Complete all runner levels
Kill Robomant
Fall into a rage 50 times
Unlock all abilities
Kill space rapper
Create 1000 robots
Upgrade 1 ability slot to 100%
Use Kick 25 times
Launch 100 rockets
Throw a pet in battle 20 times
Heal 2000 damage
Complete first runner level
Start story mode
Play with a friend on the same screen
Upgrade all 3 ability slots to 100%
Survive 10 minutes in survival mode
Unlock all pets