Solasta: Crown of the Magister

This achievement occurs after you do the main quest in Caporann. On the way out a lady named Bitteroot gave me some stuff for Arwin in the first town. I had to finish the next dungeon before I could return to Caer Cyflen though. Once there I went to the Gravekeeper's Cask and Arwin had a mission for me, then I talked to him in the tavern afterward in his usual spot and after the conversation I got this achievement.