Deep Jungle Camp
Complete Stage 1 on Standard difficulty or higher.
South American River Resort
Complete Stage 2 on Standard difficulty or higher.
Underwater Research Lab
Complete Stage 3 on Standard difficulty or higher.
Alien Cave Base
Complete Stage 4 on Standard difficulty or higher.
Main Alien Mountain Base
Complete Stage 5 on Standard difficulty or higher.
Advanced Soldiers & Aliens
Complete the game on Advanced difficulty or higher.
Dead Simple
Reach the Alien Queen without using any secondary weapons (Grenades, RPG, Flamethrower or Laser).
Weapon Master
In a single game, use all secondary weaponss (Grenades, RPG, Flamethrower and Laser).
Score: Groovy
Reach 300k points.
Pistol Start
Complete Stage 1 on Advanced difficulty using only the pistol. No machinegun or secondaries allowed.
Score: Tubular
Reach 600k points.
Score: Rad
Reach 150k points, on Expert difficulty.