Find a super secret
Exploit the Hellhound's greatest weakness
Complete Ghost Town (E3M1) on any difficulty without any Innocents getting killed
Complete The Way of All Flesh on any difficulty
Complete Even Death May Die on any difficulty
Complete Farewell to Arms on any difficulty
Complete Dead Reckoning on any difficulty
Complete Cryptic Passage on any difficulty
Complete Post Mortem on any difficulty
Kill a Choking Hand
Kill 100 Cultists
Find the secret level in The Way of All Flesh
Find the secret level in Even Death May Die
Find the secret level in Farewell to Arms
Find the secret level in Dead Reckoning
Find the secret level in Cryptic Passage
Find the secret level in Post Mortem
Complete The Haunting (E2M5) in under 40 seconds on any difficulty
Defeat the 3 Beasts of Beauty and the Beast (E6M8) in under 3 minutes on Well Done difficulty or above
Kill yourself 10 times in single-player
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