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