Here is the full list of all 57 UnEpic achievements.
You killed 10.000 monsters.
You killed 5.000 monsters.
Reach the Twin Crystals in HARD++ mode.
Kill Corvax the Mage in HARD or HARD++ mode.
You killed 2.000 monsters.
Find Harnakon without killing any crows beforehand.
You have lit all lights in the castle!!
You have lit all lights in the tower of the mages.
You have lit all lights in the forgotten tower.
You have defeated the seventh Guardian and obtained the Key of the Tower.
Defeat Medeox without killing any of its snakes.
You successfully finished the quest of the spirit, and acquired the knowledge of Protection.
You have lit all lights in the halls.
Use the toy hammer to deal the final blow to a walking armor.
You have defeated the sixth Guardian and obtained the Key of the Halls.
Defeat Gauntlik while carrying 8 vampires in your inventory.
Bring 4 or more freed goblins to the mine without using teleport or gates.
Defeat Sux Mortis with skill level 1 in armor and constitution.
You have lit all lights in the prison.
You have lit three quarters of all lights in the whole castle.
You successfully finished the quest of the spirit, and acquired the knowledge of Alteration.
Carry 666 essences of each color, 666 coins and 666 divine favors at the same time.
Carry a collection of at least 18 different potions at once.
You have lit all lights in the laboratory.
You successfully finished the quest of the spirit, and acquired the knowledge of Necromancy.
You have lit all lights in the catacombs.
You found the God of Light, and acquired the Divine Favour of Light.
You reached level 10.
You successfully finished the quest of the spirit, and acquired the knowledge of Mental Power.
You have lit all lights in the library.
You killed 1,000 monsters.
You have lit all lights in the east zone.
You have lit the half of all lights in the whole castle.
You have lit all lights in the central area.
You successfully finished the quest of the spirit, and acquired the knowledge of Healing.
You have defeated the fifth Guardian and obtained the Key of the Laboratory.
You have defeated the fourth Guardian and obtained the Key of the Catacombs.
You have lit all lights in the gardens.
You have defeated the third Guardian and obtained the Key of the Library.
Do not touch the ground or ladders for 18 seconds.
You have lit all lights in the west zone.
You have defeated the second Guardian and obtained the Key of the Gardens.
You successfully finished the quest of the spirit, and acquired the knowledge of frost magic.
You have lit all lights in the sewer.
You have lit all lights in the downs.
You killed 500 monsters.
You successfully finished the quest of Pyros, spirit of fire, and acquired the knowledge of fire magic.
You have lit a quarter of all lights in the whole castle.
Start a new game and reach the first spirit box unharmed.
Do not drink any potions until you have defeated the Dynidon worm.
Complete the room of traps unharmed in 50 seconds.
Dodge all falling rocks between the columns in the corridor to the mine.
You have lit all lights in the mine.
You have defeated the first Guardian and obtained the Key of the Sewer.
You reached level 5.
You passed the test of traps and obtained the Key of the Mine.
You killed 100 monsters.