I've had this issue for over a year now and have hoped for a fix with every update to no avail.
I have completed Loth'na caverns and have the corresponding achievement. The Upper Craglorn Cave Delver achievement does not recognize the completion and therefore will not unlock. I've retried the location multiple times over the past year with no success.
I contacted support and was advised to leave "feedback" which I did, but to my knowledge that was done over a year ago too and the issue is still there. How does one go about getting these things actually fixed?
If it cannot or will not be fixed could someone please let me know so I can cancel my subscription and just forget about it all together.