Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Burn Baby Burn I	80 Explosive Mission Kills.
Burn Baby Burn II	150 Explosive Mission Kills.
Burn Baby Burn III	300 Explosive Mission Kills.
Burn Baby Burn IV	600 Explosive Mission Kills.
Burn Baby Burn V	1000 Explosive Mission Kills.
Death's Lullaby I	Complete Catacombs on Easy.
Death's Lullaby II	Complete Catacombs on Normal.
Death's Lullaby III	Complete Catacombs on Hard.
Death's Lullaby IV	Complete Catacombs on Insane.
Death's Lullaby V	Complete Catacombs on RIP.
Drunken Samurai I	40 Melee Mission Kills.
Drunken Samurai II	80 Melee Mission Kills.
Drunken Samurai III	150 Melee Mission Kills.
Drunken Samurai IV	300 Melee Mission Kills.
Drunken Samurai V	600 Melee Mission Kills.
Fire and Ashes I	40 Explosive Arena Kills.
Fire and Ashes II	100 Explosive Arena Kills.
Fire and Ashes III	200 Explosive Arena Kills.
Fire and Ashes IV	300 Explosive Arena Kills.
Fire and Ashes V	500 Explosive Arena Kills.
Hell Not I	Complete Caves on Easy.
Hell Not II	Complete Caves on Normal.
Hell Not III	Complete Caves on Hard.
Hell Not IV	Complete Caves on Insane.
Hell Not V	Complete Caves on RIP.
Hide and Seek I	Kill 10 Wraiths.
Hide and Seek II	Kill 20 Wraiths.
Hide and Seek III	Kill 40 Wraiths.
Hide and Seek IV	Kill 60 Wraiths.
Hide and Seek V	Kill 120 Wraiths.
Lost Killcount I	300 Mission Kills.
Lost Killcount II	1000 Mission Kills.
Lost Killcount III	2000 Mission Kills.
Lost Killcount IV	3500 Mission Kills.
Lost Killcount V	6000 Mission Kills.
My Precious I	Find 15 Demon Shards.
My Precious II	Find 30 Demon Shards.
My Precious III	Find 60 Demon Shards.
My Precious IV	Find 120 Demon Shards.
My Precious V	Find 240 Demon Shards.
Over and Out I	Find 5 HQ Transmitters.
Over and Out II	Find 10 HQ Transmitters.
Over and Out III	Find 20 HQ Transmitters.
Over and Out IV	Find 40 HQ Transmitters.
Over and Out V	Find 80 HQ Transmitters.
Skull Collection I	50 Arena Headshots.
Skull Collection II	200 Arena Headshots.
Skull Collection III	500 Arena Headshots.
Skull Collection IV	1000 Arena Headshots.
Skull Collection V	1500 Arena Headshots.
Smash Them All I	20 Melee Arena Kills.
Smash Them All II	60 Melee Arena Kills.
Smash Them All III	100 Melee Arena Kills.
Smash Them All IV	200 Melee Arena Kills.
Smash Them All V	400 Melee Arena Kills.
Smells Like Death I	100 Arena Kills.
Smells Like Death II	300 Arena Kills.
Smells Like Death III	1000 Arena Kills.
Smells Like Death IV	2000 Arena Kills.
Smells Like Death V	4000 Arena Kills.
Too Many Trophies I	100 Mission Headshots.
Too Many Trophies II	300 Mission Headshots.
Too Many Trophies III	800 Mission Headshots.
Too Many Trophies IV	1300 Mission Headshots.
Too Many Trophies V	2000 Mission Headshots.
Undead Next Door I	Complete Graveyards on Easy.
Undead Next Door II	Complete Graveyards on Normal.
Undead Next Door III	Complete Graveyards on Hard.
Undead Next Door IV	Complete Graveyards on Insane.
Undead Next Door V	Complete Graveyards on RIP.