Halo: Combat Evolved

Halo: Combat Evolved Campaign consists of 10 levels:

1. The Pillar of Autumn - "Escape intact as Covenant forces board your ship."
2. Halo - "Seek out surviving Marines and help them fight the Covenant."
3. The Truth and Reconciliation - "Board a Covenant ship in an attempt to rescue Captain Keyes."
4. The Silent Cartographer - "Search for the map room that will lead you to the secrets of Halo."
5. Assault on the Control Room - "Defend the Control Room against wave after wave of Covenant troops."
6. 343 Guilty Spark - "Creep through a swamp to meet the only enemy the Covenant fear."
7. The Library - "Fight your way through an ancient security facility in search of the Index."
8. Two Betrayals - "Re-activate the weapon at the heart of Halo... and learn the truth."
9. Keyes - "Stage a one-cyborg assault on a Covenant ship and bring back the Captain."
10. The Maw - "Destroy Halo before Halo destroys all life in the galaxy.

Adapted from http://halo.wikia.com/wiki/Halo:_Combat_Evolved