You need a good working mic co-op with mic is the key to this archievement.
Secondly a good working internet connection.
Of course the basics off playing zombies, dont kill the last one, dont knife cause of nuke change etc...
Furthermore some experience killing zombies.
And have patient, this archievement can be done in a hour with a bit luck of emp, but its trial and error for most players, or just listen to youre coop players very well.