Defeated the evil deity, Hastur.

Destroyed 100 saucers

Got 100 skill shots

Captured 50 live aliens

Everything maxed out

Got the x9 multiplier

Completed the Mars levels

All three campaigns completed

Complete Zombie Campaign

Zombie - Get a full squad

Lose the first mission in either Campaign

Fully upgrade your squad

Use an airstrike to kill 3 enemies at once