I still wish WoW (and other MMO's) would have a 'quest completed' section like EQII has, as this is a nice record of all the quests you've done and you can quickly tell if you've exhausted quests in an area.
That said - I'm actively pursuing the following fun achievements -
- Explorer (World Explorer gets the Explorer title) This is proving to be alot of fun and seeing areas that I hadn't before - separate post to come with some interesting screenies!
- Ambassado of the Alliance (Exalted with all five races - the gnomes are killing me . . .62 rep per quest now - ARGH! 2000 to go!) Started this one only as I need the mechano-striders for the Albino Drake!
- Leading the Cavalry (5o mounts and I get the albino drake - this has a new layer too - GAWD I'm behind things LOL!!!)
- Shop Smart, Shop Pet ... Smart (they've increased this from 50 to 75 for the next achievement and I'm still sitting at 43!!!)
Gosh, I wonder if I'll ever see level 80 finding so many none leveling things to do - LOL!!!
Reference - WoW achievements