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Destroy an alien in level.
Destroy 5 aliens in level.
Destroy 10 aliens in level.
Score 10000 points in level.
Collect all trophies in game.
Collect shield power up.
Collect multi shot power up.
Collect power shot power up.
Collect combo of 2 or more power ups.
Score 20000 points in level.
Destroy aliens halfway through the level.
Complete a level by destroying all aliens.