Achievements Question

I have a question on the Achievement System. While I understand the system and have read the post. I am a little bit lost in the fact why I am missing some achievements. For example, while I was beta testing WOLTK we were told the system read for quest/items you have to help you get your achievements.

But now that It's live - for example I have "Husk of Old God" Sitting in my bag. But yet It shows my c'thun kill as not being there.

So My Question overall is - are they still working on updating the loot list/quest list for achievements or is this it?