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