I've been having this problem for the past fortnight or so, but it does seem to have worsened. I was thinking it was related to the adverts being served (I'd have more success with videos playing if they were prefaced by the contrejour.ie advert), but if paid members are also affected, that scrubs that idea.
" Mine still aren't updating :( And it's driving me insane! It updates the game I've played, but not my achievements. "
I'm having the same problem. I also tried re-syncing my Xbox Live account information (by deleting the account and re-adding it), but it's now it's somehow unable to scrape information from Xbox Live. I don't know if that helps. "
Yeah, I tried that myself and am now sat at #6890 in the queue, having gone up 400 spots since this time yesterday. At that speed, it'll finally resync my account in 2.5 weeks, which doesn't sound good.