Fulton extract an enemy soldier.

Capture an outpost or guard post.

Achieve 46 Stars in AR Challenges.

Complete the campaign on 'I'm Too Young to Die', 'Hurt Me Plenty', 'Ultra Violence', or 'Nightmare'.

Defeat the Cyberdemon

Upgrade a Rune

Glory Kill all common enemy types in the campaign.

Warp to Hell

Perform 200 Glory Kills

Initiate Knightfall Protocol.

Wayne vs Crane.

Apprehend Scarecrow's senior commander.

Destroy all of the militia checkpoints.