So I am 1 away from that achievement - why can't I see which ones I have found please. Getting around the island checking them off again is just annoying - tell me which one I'm missing please in the achievements tab/same for Dragonkin statues... :'( . However I have enjoyed 50% of the content so far - well done =]
They said it wasn't possible to add the Ancient Zygomites to the Achievement system, due to limitations with said system. They are aware of this issue and might add something to keep track of them. Such as a item, most likely a book.