Yes, that's right, all of them. You've probably heard about this already (we're a little late to the party, just because it seemed a little fishy to us at first), but a player in Taiwan has an Armory profile that claims he (or she, though the character is a male tauren druid) has achieved all 986 achievements available in the current version of World of Warcraft. That's everything, from Loremaster, to all the ToGC Tributes, to the Pilgrim's Bounty holiday rewards,
even Insane in the Membrane. If there's something you can do in WoW, this guy seems to have done it. He hasn't finished this year's Winter's Veil achievement yet (it's not actually possible until the 15th), but he has done a PvP achievement twice, apparently, so he's still 986/986.
I'm still a little doubtful: as you can see above, the Feats of Strength bar looks like it's empty, but this guy actually has lots of Feats done as well, including all of the realm first feats (including First Aid, and Leatherworking, all within days of each other). It just doesn't seem possible that one character could do all of that. But it all seems to check out, so we'll give him his due: Congratulations, "Littlegray" of Wrathbringer. And just in case you hadn't heard: there are other games to play.
Update: I thought Insane in the Membrane was an achievement, but it is actually a Feat, and he does not have it. Thanks commenters for the clarification.