I have seen some posts regarding this topic around on the Mop forums but I'll ask this myself - will mounts and achievements be battle.net wide? I've seen some people say yes, and some say no, but they have not linked any proof or anything to know where they're getting this info.
Currently it's not possible to have 2 mop beta accounts so It's not possible to test it that way...
As a person with two accounts I'd just like a confirmation either way with a source if possible please before I go and start grinding mounts for both accounts....