Collect all trophies
Defeat the first martian
Interrupt 5 abductions
Use the grenade weapon
Complete a level without any automatic reloads
Complete any level in Ranger mode
Complete any level in Ace mode
Complete the first level
Obtain a streak of at least 50
Complete a level with at least 95% accuracy
Defeat 1000 Martian Troopers
Destroy 50 Flying Saucers
Complete all levels and save Planet Earth
Complete a level with zero human casualties
Complete any level with at least 95% of the destructible objects destroyed