If you have gotten this achievement in single player then this one will be easy for you.
First thing you need is a 2nd dummy controller, then start the level. you will go through the level just as you would if you were following one of Dmbledore's great videos. Ignore the deaths and hits that the dummy takes it does not effect your frenzies and whatnot.
Liam Neil Adds that it only works in Split screen co-op.
Thanks again to Dmbledore.