An Ancient Evil

Destroyed the demon Aec'Letec.
Return to Ulgoth's Beard with the Soultaker Dagger and you will be robbed of it when you enter the area. Speak to Hurgan again in the Inn and tell him what happend. He will ask you to retrive the dagger from the cult in the storehouse. Head in to the storehouse kill the cult members and the demon Aec'Letec for the achievement.