Here is the full list of all 52 DOOMBLADE achievements.
Kill 100 Enemies
Kill 1000 Enemies
Kill 3000 Enemies
Finish The Onion Gauntlet
Find Mother Tongue
Spend 1000 Bones
Spend 10,000 Bones
Build an additional heart
Build a Rune of Ruin
Defeat the Dread Lords within 5 hours
Defeat the Dread Lords within 3 hours
Help the Wilderflirt find a lover
Find all Power-Ups
Empty every bone stash
Collect all Tristone pieces
Buy out every shop’s full inventory
Find all Gloomsouls
Germinate all UNIT spores
Read all Dread Edicts
Read all Gloomstones
Destroy all the Dread Lords’ propaganda
Complete the Atlas
Find all heart pieces
Find all Runes of Ruin pieces
Reach maximum onion capacity
Finish the game with 100% completion
All Joystones Found
Defeat the Dread Lords without the aid of the Gloomsouls
Defeat the Dread Lords using the power of the Gloomsouls
Destroy the Dread Lords’ propaganda and feed them to the World Eater
Destroy the Dread Lords after all spores have been sown
Free DOOMBLADE
Lose a friend
Destroy the Sovereign Citadel’s power supply
Reach Paradise Wells
Clear the horde within the Doomprison
Clear the horde within Molded Mines
Defeat the Shieldclad Cannons
Defeat the Subterranean Broodsmasher
Defeat the Blightbearer
Defeat the horde within Gloomhaunt
Defeat the Assassination Squad
Defeat the Runed Golem
Clear the Voidchild’s horde
Defeat the Cybersentinel
Defeat the Void Dragon
Defeat the Devout
Defeat the Oozecreepers
Clear the horde within the World Eater
Clear the Hive
Defeat the Dread Lords
Defeat the Voidchild