Here is the full list of all 10 Space Pirate Trainer achievements.
Get a multiplier combo of 12
Destroy the Mother Droid
Reach wave 20 without using a Shield
Survive wave 23 for one minute without using your Gun, Shield or Volton
Destroy the Ray Boss
Win the Game
Pull a droid into its own laser
Zap 25 droids with the Tesla Coil in one game
Destroy your first Heavy Droid
Reach wave 10