1 down... lots to go!
Not unlocked yetDefeat the first martian
Safe for now
Not unlocked yetComplete the first level
Streaker
Not unlocked yetObtain a streak of at least 50
Spot on!
Not unlocked yetComplete a level with at least 95% accuracy
Little Green Men
Not unlocked yetDefeat 1000 Martian Troopers
It's just a weather balloon
Not unlocked yetDestroy 50 Flying Saucers
Saviour
Not unlocked yetComplete all levels and save Planet Earth
No-one left behind
Not unlocked yetComplete a level with zero human casualties
MUST DESTROY!
Not unlocked yetComplete any level with at least 95% of the destructible objects destroyed
Beam me up Scotty
Not unlocked yetInterrupt 5 abductions
Fire in the hole!
Not unlocked yetUse the grenade weapon
Bullet counter
Not unlocked yetComplete a level without any automatic reloads
Ranger
Not unlocked yetComplete any level in Ranger mode
Ace
Not unlocked yetComplete any level in Ace mode