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Kill an enemy in level.
Kill 2 enemies in level.
Kill 3 enemies in level.
Save at least 5 items from enemies.
Complete a level by killing all enemies.
Kill enemies halfway through the level.
Collect power shot power up.
Complete 2 levels in game.
Collect shield power up.
Collect multi shot power up.
Complete 3 levels in game.
Collect all trophies in game.