Survive for 5:00 in Survival Mode.
Post a time on all level leaderboards.
Defeat 300 enemies
Complete the game in less than 3 hours
Complete the game once
Harm the final boss using each alien before delivering the final blow.
Collect all energy and health extenders
Collect all keycards
Unlock all alien forms by beating levels 1-10
Defeat 50 enemies
Complete a level without collecting any health or energy items
Defeat any level without getting hit
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