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