Quote Originally Posted by Naysayer View Post
I traded the hollowed helm to one of my alts and haven't gotten credit for the achievement so far. The trade expiration hasn't expired yet, dunno if that will change anything.

Hollowed Helm update:

Ok, after the trade expiration was up (i was offline) I logged back in and the alt shaman DID get credit for the achievement. I don't know if you can pass one hat around and get credit, but I did get credit for one hat on two separate characters for trading it once.