There are sooo many things that we ask developers to do, so this one goes on a back burner someplace:
Achievements require some special rare items etc that I know I'll never use again after they have been obtained. So I'd like to suggest an idea that would free up a couple of 10 slot bags in folks banks: namely once you have something and you don't plan to use it again (sorta similar to a key ring) you can put it into a an "achievements locker" where it will still count toward your achievements but where it can gather the dust of ages. Maybe you could be allowed to access it once a year or something....