Achievements
3×50 (30) - In any single level, purge at least 150 enemies, killing a minimum of 50 with each weapon type.
Completist (40) - Complete the game in all three difficulty settings.
Crispy (10) - Purchase the lightning gun.
Fully Loaded (40) - Get 2,000 rounds of ammo into your minigun.
Aint No Rookie (10) - Complete the boot-camp without taking damage.
All Hail The G Man (50) - Complete 40 pages of endurance in hard mode.
Army Of One (50) - Kill 10,000 martians.
Boom Boom (30) - Use a launcher weapon to kill 10 martians in a single blast.
Getting Started (10) - Kill 1,500 martians.
Gifted (10) - Complete 10 pages of endurance in easy mode.
Mean Streets (30) - Complete the city chapter.
No Sweat (20) - Complete 20 pages of endurance in normal mode.
Pacifist (30) - Complete a level without firing a weapon or receiving any damage.
Rooted (40) - In story mode, city chapter, defend one spot turning left and right, but don't move for 2 mins.
Rush-a-holic (40) - Grab all rush crates in story mode.
Space Marine (10) - Complete the Moon chapter.
Super Market Sweep (40) - Buy all available items in a single visit to a vending machine.
Hat Trick (30) - Upgrade all three weapon-types in a single visit to a vending machine.
High Flier (20) - Collect all meteor rocks in a chapter.
Home Coming (20) - Complete the army-base chapter.
Ka-boom (10) - Purchase the plasma launcher.
Martian Purger (30) - Kill 5,000 martians.
Sustain (30) - Purge 50 enemies in a single beam-attack (one press of the fire button).
To The Teeth (30) - Purchase all weapons.
Vending Machine Ping Pong (30) - In story mode, army-base chapter, access both vending machines, alternating between them 5 times.
Yeah Baby (10) - Purchase the minigun.