Collect all trophies in game.
Complete mission with at least 2 cities left.
Complete a level by destroying all alien ships.
Complete mission with at least 2 turrets left.
Score 50000 points in game.
Destroy half the alien ships in game.
Destroy bullet fired by alien ship.
Destroy an alien ship with center turret.
Destroy an alien ship with right turret.
Collect ammo power up.
Destroy an alien ship with left turret.
Destroy alien ship dropping power up
999
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26943
14324