Exploit the Hellhound's greatest weakness

Complete Ghost Town (E3M1) without any Innocents getting killed

Complete The Way of All Flesh

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

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

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

Find a super secret

Complete all of Death Wish

Complete all of MARROW

Find all Secret Levels in Death Wish

Find all Secret Levels in MARROW

Complete Death Wish E1M3: Frostburn in under 70 seconds

Complete Death Wish E1M4: The Abyss in under 100 seconds

Complete Death Wish E1M7: Urban Decay in under 20 seconds

Complete Death Wish E2M7: Paradise Lost in under 40 seconds

Complete Death Wish E3M11: Human Nature in under 70 seconds

Complete Death Wish E3M2: The Tenant in under 60 seconds

Complete Death Wish E3M4: Bogey Beach in under 90 seconds

Complete Death Wish E3M6: Last Resort in under 30 seconds

Complete Death Wish E4M4: History of Violence in under 80 seconds