Finish a stage with your health lower than 5%.
Collect 100 000 stars.
Complete Stage 8 without using power-ups.
Destroy at least 15 enemies with one Mega-Bomb.
Destroy all enemy towers on Stage 5.
Ram through an enemy wave with your Energy Shield.
Burn through 10 enemies with your Laser.
Destroy 10 000 enemies.
Earn 10 medals.
Rescue 100 people.
Destroy 1 000 enemies.
Collect all the cards.
330
3598
19008
1019
18718
11680
38
