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