Here is the full list of all 12 XLarn achievements.
300 Monsters Killed
150 Monsters Killed
Survive Pandoras Curse
500 Monsters Killed
700 Monsters Killed
50 Demons Killed
5 Demonlords Killed
Demonprince Killed
Reach Exp Level 20
Reach Exp Level 50
Reach Exp Level 70
Be Blinded three times and survive it