I realized i had a freebie waiting for me @"the achiever" was just a few clicks away, as i had all the rep needed to go to tabard vendor and buy my way to it.
At the vendor, i bought tabards, equipped em, and got the achivement.
After getting the achi, i decided to ditch the left over tabards in my backpack. So i spoke to the vendor again, to sell them, only this time she had 2 options when i clicked here, the lower one being " Shit, ive lost my tabard of the achiever..."
I pressed it, and received a tabard of the achiever.
This achievement sends you a tabard in the mail upon completion.
I then proceeded to go over to the mailbox, to loot yet another tabard.
At this point i had 2 tabards. Probably unintended by blizzard.
There's probably a few other game mechanics that sends u stuff in the mail, that might allow for the same exploiting, just sayin'