Complete the game once

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

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