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