10man Saurfang strat (ez mode)
Raid makeup: Prot pally, Prot Warrior, Disc priest, Resto Druid, Blood DK, Ret Pally, Fury Warrior, Arcane Mage, Combat Rogue, Enhancement Shaman.
We didn't have the ranged to do the suggested strategy so I came up with one to meet the strengths of our raid makeup. This made the fight very quick and very simple and we almost got the achievement on our first downing of him.
The main problem here is the adds that spawn. So I assigned our prot warrior and ret pally to stun the one that spawned to our right and all to focus him down quickly (this took no longer than the duration of the stun). I myself (being a prot pally) used my hammer to stun the one on the left which kept it incapacitated until our focus changed to him..where he was promptly snuffed out as well. Then our focus went back to Saurfang and we repeated this tactic over and over. He got his 3rd mark off when he was at 5% so I know that with better execution and a bit more dps we can easily get this achievement on our next downing of him.
One last thing, we used our blood lust right at the beginning to get a head start on the encounter and it proved to be the best way to use it.
Edit: Just wanted to add that we did indeed get the achievement(I've gone and made a mess) on our second week's attempt!! WOOT!