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