Not Even a Scratch

The idea is probably to get through the first wall and then use Seaforium charges to blow the doors from there on out

Edit: I've gotten this twice on my way to 100 wins and I've seen Horde get it once. Basically just get lucky enough to be matched up against a pack of monkeys and you will get this achievement done.

Things to remember if going for this achieve:

-The Demos (as of 4.2) can be buffed with a Druids Stampeding Roar for a really nice speed boost.

-Healers can and should dispel the Demos, which helps to keep them alive

-Frost Mages, Rogues, Warriors, DKs should all help to peel melee off the demos with slows. Since people can't sit in the Demos to keep melee off them anymore, you need to be extra diligent in your peels.

-All stack one side, don't bother capping GYs as this gives the Horde the opportunity to kill one demo behind your main group to spite you. (It's happened ;_;)

If you defend first round and manage to prevent the opposing team reaching Titan Relic for 10 minutes, they will most likely won't bother fighting at 2nd round when you attack. (since even if they succesfully defend they will only get a draw- not a win). So the most ideal situation to get this achivement is defending succesfully first round. That's how i got this on a pure pug.