A while back I had received the "2000 quests" achievement. It's dated 1/04/13 completed by Lavivrus, and I now notice when I click on the "3000" achievement it is less than 2000 complete. I'm sitting at 1988. I had noticed this about a month or so back when it showed it in the 1800s, but it's been really irking me. Where did all my quests go???? I want my numbers back =(
its an old bug. it happned to me alot. if you go back to a lower level zone and do a quest it will update to your completed list. the system does record it correctly but it will not show it correctly, its been a bug since cata's changes.