No achievement for Dzemael Darkhold

I ran Dzemael Darkhold till 45, and after that I gave it up since I got my class gear. However, when I did Aurum vale I though I got the achievement for mapping all of Coerthas. It didn't and when I checked I saw that Dzemael Darkhold was incomplete. Yet it shows me the entire map and some details when I open that. I have been to every nook of this dungeon, yet no achievement. Any leads on this? Perhaps I forgot a special place? I have been to every location on the map after the 1st bossfight (lots of spaces that can be forgotten there). I opened every door. I would love to get the achievement.

Did you try entering again?

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