Destroy at least 15 enemies with one Mega-Bomb.
Destroy 10 000 enemies.
Burn through 10 enemies with your Laser.
Ram through an enemy wave with your Energy Shield.
Earn 10 medals.
Rescue 100 people.
Destroy 1 000 enemies.
Finish a stage with your health lower than 5%.
Destroy the lighthouse without touching it.
Earn 100 medals.
Collect 100 000 stars.
Collect all the cards.
Complete Stage 8 without using power-ups.
Destroy all enemy towers on Stage 5.
