The World is Safe For Now
Complete the game once
Survive for 5:00 in Survival Mode.
The Fast Lane
Complete the game in less than 3 hours
Complete a level without collecting any health or energy items
Collect all keycards
Playing with a Full Deck
Unlock all alien forms by beating levels 1-10
Defeat any level without getting hit
A Hero's Workout
Defeat 50 enemies
A Hero's Marathon
Defeat 300 enemies
No Time to Waste
Post a time on all level leaderboards.
Harm the final boss using each alien before delivering the final blow.
All Powered Up
Collect all energy and health extenders