help with insane in the membrane achievement

Greetings, I've been trying to get this achievement however, I can't find a way to increase steamwheedle cartel rep.. I've reached exalted with booty bay and gadgetzan but am stuck on revered on the others.. I've seen a lot of guides on how to reach exalted and the main thing to do is to kill some pirates in tanaris however on warmane they don't drop any rep. I've seen some players with "the insane" title which means there is a way to complete this.
Please help!