They aren't all easy, but none of them require you to be level 90 and epiced out.
We've gathered some achievements that are a bit more out of the way, but all of which you can either pick up or work on while you're leveling. You'll find you get achievements for leveling, achievements for completing quests, achievements for picking up gold, achievements for leveling professions, there's even an achievement for visiting the barber's shop. If you've played WoW for more than a half hour or so, chances are you've noticed the game's achievement system, which rewards you with (meaningless) points and sometimes more tangible rewards (like unique tabards or special titles) for doing certain things in the game.