Full list of all 101 Skul: The Hero Slayer achievements.
The base game contains 57 achievements, and there are 5 DLC packs containing 44 achievements.
Acquire Neo Samurai
Acquire Soul Knight
Acquire Eternal Werewolf
Defeat the First Hero as Little Bone
Defeat the First Hero without saving the stage NPC
Kill 100 adventurers
Stay in the black market for 5 minutes
Keep talking to Headless
Play on Rookie Mode
Reach the top of the throne in the Demon King Castle
Acquire Gold Gargoyle
Acquire Abyssal Monarch
Acquire Demolitions Expert
Acquire Dark Alchemist
Acquire Vanguard Captain
Acquire Carleon Commander
Defeat the First Hero without getting hit
Defeat St. Joan II without getting hit
Acquire Eternal Mummy
Acquire Devil Berserker
Acquire Ghoooooul
Defeat Chimaera without getting hit
Acquire Joker
Acquire Magnifico
Acquire Minotaurus III
Defeat the Leiana Sisters without getting hit
Acquire Sniper
Acquire Desperado
Keep restocking from the collector
Acquire Warlord
Acquire Poseidon
Acquire Defender Captain
Acquire Elder Ent Skull
Restore the Demon King Castle to its original form
Reach the top of the chandelier in the Demon King Castle
Acquire Arch Lich
Acquire Destroyer
Acquire Royal Guard Captain
Acquire Frozen Spirit
Acquire Dark Avenger
Defeat Yggdrasil without getting hit
Acquire Champion
Rescue the Demon King and return to the Demon King Castle
Defeat the Sword of Carleon, the First Hero
Defeat the archbishop of the Leonia Order, St. Joan II
Acquire Super Rock Star
Acquire Yaksha
Defeat the distorted goddess, Chimaera
Acquire Nightmare
Acquire Master Ninja
Defeat the adjutants of the Gold Mane Knights, the Leiana Sisters
Acquire Gambler
Acquire Grim Reaper
Die from a trap
Defeat the elder ent, Yggdrasil
Return after experiencing death
Stay in the black market for 1 minute