Highlight the following to find out which quests I think/know can be completed in advance, or at least complete wihtout moving from the quest-givers door: Cavalier, Champion, Rouge, Spy, Master, Bounty Hunter, Priest, Warlock, Wizard, Archmage

and the following cannot be completed (although you can sometimes prepare for them by cleaning out the environment)Black Knight, Initiate, all Archer promotions, Ranger Lord (you can get the item, but some travelling is required), Priest of Dark/Light, Great Druid, Arch Druid (get item OK)