There are a few achievements in every expansion that manage to get away from us. I'm not talking about stuff that we shouldn't reasonably expect to get (your completion percentage on dungeon and raid achievements will inevitably nosedive if you can't make raids anymore), but there's always some stuff that people feel they should have gotten or worked at for ages that never turned up.
Now, you're reading OverAchiever because you're a dedicated achievement hunter or enormously entertained by the people who are -- and I think you know what this is like. There's almost a sense of hostile guilt as you look at the stuff you don't have, because those unfinished percentages taunt you. Sometimes it's not your fault. Sometimes, however, you just need to get off your arse.
These are three achievements -- easy, medium, and hard -- that players often put on the back burner while occupied with other pursuits. Two of them just got a lot easier -- or at least faster -- to do after patch 5.0.4, and all three will get more inconvenient when Mists of Pandaria hits.
Oh, and for pet collectors, we have some welcome news inside about Tol Barad.