Shockroach Colony: Defeat 50 Shockroaches.
Shockroach Swarm: Defeat 500 Shockroaches.
Shockroach Infestation: Defeat 5000 Shockroaches.
Alien Walker Limper: Defeat 50 Alien Walkers.
Alien Walker Crippler: Defeat 500 Alien Walkers.
Alien Walker Mutilator: Defeat 5000 Alien Walkers.
Alien World Refugee: Complete one round of Alien World.
Alien World Survivor: Complete four rounds of Alien World.
Alien World Conqueror: Complete ten rounds of Alien World.
