Not sure where to post this but this looked like the best bet. I found a post a long time ago that also had this problem, I had this problem at the time and talked to someone and was told if they achievemts are able to be earned back then they cant do anything. Well at the time achievements seemed to be coming back but there are two, possibly four that I cant seem to earn back.
Sideways and Hero of the People are not being unlocked again. After hours of playing, these quests that should unlocked after an hour or two, will not unlock.
There are two others that I cant quite confirm to be broken but seem that way. Delver and reader dont seem to be unlocking and I'm sure but havn't been wanting to count, that I've done them many times but they still wont unlock.
I've tryed uninstalling the game, reinstalling, deleteing all my saves and starting fresh nothing is working. Hope to see this fixed soon. Incase I wasn't clear, I've had these achievements unlocked before but they dissapired one day. This happened long ago.
Off topic and something I'm sure you guys cant fix, but ever since 1.6 patch I've been getting random freezes. I've been watching some videos of other people playing and they seem to have the same problem even on PC.