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Destroy bullet fired by alien ship.
Destroy an alien ship with left turret.
Destroy alien ship dropping power up
Destroy an alien ship with right turret.
Collect ammo power up.
Destroy an alien ship with center turret.
Destroy half the alien ships in game.
Complete a level by destroying all alien ships.
Score 50000 points in game.
Complete mission with at least 2 turrets left.
Complete mission with at least 2 cities left.
Collect all trophies in game.