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