Can someone please explain this to me? I just beat the entire first chapter on episode 5 without dying and did not receive my achievement. This is really irritating seeing as that mission was a real pain.
The description is wrong, you need to do it on Heroic or harder, and you need to have atleast one of those thingamajigs you need to defend intact. You can die as many times as you want. I suggest doing it in co-op.