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