First off lurking through the forums or the front page I noticed there was nothing in regards to this but if its been brought up before go ahead and flame me but I found something unique looking at the new achievements page.
http://i.imgur.com/O6C8Z.jpg
The toon I am using is "Ryxas" my premade 85 monk. The toon I am looking at this one achievement earned "Operation: Gnomeregan" that was earned by "Rixas" a toon I copied over from live.
Right now its showing feat of strenghts and most general achievements that carried over as earned by "Rixas".
Hopefully this is a step to the implementation of Account Wide achievements, especially those who earned achievements on our alts and help with the ease of main swaps.