Here is the full list of all 31 EvilQuest achievements.
Reach a Vitality level of 35
Equip all Chaos Gear
Kill 1500 enemies
Open The Lightning Seal
Equip all Dragon Gear
Reach a Strength level of 35
Kill King Jerric
Open The Fire Seal
Eat 3 Whole Chickens
Kill 750 enemies
Open The Ice Seal
Open The Earth Seal
Kill King Jerric's top general
Learn Ice1 and kill your teacher
Murder 5 deserving NPCs
Beat the game on Normal
Beat the game on Difficult
Obtain a portrait of Galvis
Kill 50 enemies with Fire2
Kill 5 enemies at one time with Lit2
Freeze 30 enemies with Ice
Kill 4 enemies at one time with Earth2
Kill 8 enemies at one time with Shadow2
Kill 100 Dragons
Eat 10 Hams and 10 Steaks
Eat 75 Pieces of Food
Reach a Toughness level of 35
Reach an Intelligence level of 35
Give 1000 GP to a dancer
Equip The Invisibility Cloak
Equip The Amulet of Magic