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