There's still more, the achievement only requires you to do almost all of them. I'm not sure why it's not actually all, and the amount that's left still varies between zones, in some cases it could be a mere few, but others, almost a dozen.
If you're looking to truly complete all of them, since there's no quest list, I'd advise looking for offsite lists. You can also look at your map of the zone (if it's complete) and seeing if there's any black quest-area icons left (ruins, villages, trees, etc, all the quest-hub icons)
If you're on PC, I think there was some addon that did pretty well at showing locations for quest starts, although I can't remember the name of it.