The best way to get this is having the infinite ammo skull on and bigger exlosions on!
Play with a partner so you will have more of a chance of surviving than getting frustrated playing solo always take cover you will go down quite fast if you go in guns blazing ( which is a bad idea) if there is not much cover about just keep back so the enimies will have less of a chance of hitting you or sneaking up on you. Also take advantage of all of the veichles aswell they will help alot and a less chance of dying.
Remember to keep calm aswell stressing out or getting annoyed at this one section will not help you every level is possible!
Other than that all seem to be easy achievment i have provided links to the 2 main skulls that should be activated to help alot ( i take no credit for these videos!)
Also if you do want to totaly make sure you are ready for this do a normal playthrough so you get familar with the levels so you know what is coming next and what surprises that comes up and the hunters are easy to kill when you have a partner because you can just spam grenades at them so easy kills :D
Hope this helps all you guys attempting this ( if you vote Negative please comment why i may have missed some points in this) Good luck guys :D
Edit: turn boom off during the maw level as it could be very frustrating! :)