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