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