King of the Hill Achievement
King of the Hill10
Defeated the Arishok.
This is missable. Doing this quest is the point of no return for Act II so make sure you complete anything else you would like to do before proceeding. During the quest "Demands of the Qun", you will encounter two separate scenarios based on whether or not you completed the companion quest for Isabella:
Completed 50% Companion Quest: Isabella will return and you have the option to hand her over to the Qunari or defend her. You MUST defend her in order to fight the Arishok. Choosing to hand her over without violence will cause you to miss the achievement.
Uncompleted 50 % Companion Quest: With Isabella out of the picture, the Arishok will ask you how you want to resolve the conflict. Select “On the battlefield” for a one-on-one duel (toughest option). You can also choose to battle him with your party by selecting "By returning the book" followed by "When you put it that way". Do not choose "We can work this out" because the achievement will not unlock.
Strategy for this fight can be found in the video below: