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