19 missions for Alien Assault, see decription for more details.
- Purify: Flame designated targets.
- Blockade: Deliver 1 items.
- Stranded: Flame designated targets.
- Lost Scrolls: Deliver 3 items.
- Advance: Flame designated targets.
- Swarm: Escape with 1 soldiers.
- Cleanse: Flame designated targets.
- Fight To The Death: Kill 90 aliens.
- Covering Fire: Deliver 1 items.
- Rearguard: Flame designated targets. Full armoury.
- Tomb: Seal 3 doors. Full armoury.
- Deadzone: Secure 5 squares.
- Terror: Flame designated targets.
- Vault: Seal 4 doors.
- Beast: Kill 50 aliens. 18 Turns.
- Nightmare: Secure 4 squares.
- Eclipse: Flame designated targets.
- Prey: Deliver 4 items.
- Reckoning: Kill the alien leader.