I've only leveled one toon to 80 (Ret) and have never done any of the Northrend instances. I currently have a 5 pally team at 65 and my ultimate goal for PVE is to get that achievement & drake for the team.

Are there any parts of the achievement that are going to be impossible for a 5 pally team? I really enjoy the pallys but will switch to a pally/shaman team if that is what it is going to take to get that acheivement. I'm just not too fond of the shaman playstyle.