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