Complete 3 songs in Quickplay.

Earn a total of 10,000,000 GMP or more.

Make Quiet available for deployment.

Kill 50 enemies using the Chainsaw

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

Kill 150 enemies while using Power Ups

Acquire all weapon mods

Defeat the Cyberdemon

Acquire the BFG

Earn the Mastery for a weapon mod

Fully upgrade a Praetor Suit category.

Warp to Hell