Well, I've done some of them on my druid-the cooking one, Metzen, dancing snowman, Ogri'la and Bros before Ho's.
Not sure I'll ever get the winter hat if I don't get lucky on a world drop. And I don't do pvp, so I'll never get the final achievement(not that I care-so I guess having the hat for the one achievement matters not as well). Greench area was way camped this morning, so that one will wait for a few days. Made cookies for all of my characters(although that one seems pointless, no achievement and he gives you low level mats in return).
It is fun to see though. Personally I'm waiting for New Years. That's my birthday. :)