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