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