Dying Light - HELLRAID Nightmare difficulty NO DEATHS

Finally got around this tedious achievement. Honestly I hope they will not add any more achievements to this "undead" game.
For those who don't know, Hellraid was supposed to be a (nice?) stand-alone game that never saw the light. Instead, they turned back and misfired the results of broken development in this boring DLC.
Thanks to my steam colleague SørenStop! - without his legendary skills I would have not been able to finish it. And honestly, playing this alone is no fun at all.