Discover a secret area
Defeat the Mother of All Demons on The Absolution
Finish 'No Escape' on Watch Me Die! skill level
Finish the Lost Levels mission
Find the BFG9000
Find the Unmaker
Acquire all 3 Demon Key Artifacts in the main campaign
Kill a Cyberdemon
Finish a 'Fun' Level
Locate the secret level 'Hectic'
