Die at least once.
Complete the training level.
Complete level 5.
Complete level 10.
Defeat the boss at level 40.
Defeat the boss at level 20.
Defeat the boss at level 60.
Destroy 50 enemy spaceships.
Destroy 500 enemy spaceships.
Destroy 100 enemy spaceships.
Destroy 1000 enemy spaceships.
Destroy 5000 enemy spaceships.
Complete level 40 with full health.
Complete level 20 with full health.
Complete level 59 with full health.
Complete level 60 with full health.