I've only heard of one or two others having this before, but I just ran into it tonight. Initially, the achievements window showed as below but with the normal categories populated on the left. I tried zoning, and it went completely blank as shown here: I tried camping and coming back, I tried restarting the EQ instance, and I tried closing all EQ instances (had 2 up, second instance was fine) and started a single instance with the problematic account: same result each time. After waiting some time after the final attempt, the achievements window eventually repopulated.
Could be a lag related issue. For the past few days, whenever I've finished a collection, it will sometimes take upwards of a minute before the reward window pops ups (multiple accounts).
I have this issue pretty much every time I log in. When I zone, my window populates, however the next time I log in, it'll be blank again. Only started happening to me about a week and a half to two weeks ago. *Edit* Woops on the necro. I was searching and happened to see it without looking at how old the thread was.