Hey Zar. Since you're at it, could you guys poke around some of the questions asked on the comments of that article for us?
I'm wondering if it's "wow licence-wide" achievements or "Battle.net account-wide" ones, for instance.
For all intents and purposes, assume that the game doesn't really understand the concept of a WoW license. The account-level achievement system will all be based on the Battle.net account and not each individual WoW license attached to it.