This secret achievement "Respect For The Dead" will only give you 5 gamerscore but you get access to Griffin's secret stash of weapons: Incenary grenades, Boomshot, and Torqe Bow....
(Doesnt matter on what difficulty)
Be care in walking in Act 4, Chapter 1 cause of the ash citizens of Char. Make sure you dont shoot your weapons or run into of them or you teamates (AI's dont count). If any of the traps hit the ash people have no worries it wont cost you the achievement....there will come a point where you are going up a hill a shopping cart will roll down towards the ash people stop it before it does. After defeating the 2 Stalks Ash Man will come down the elevator and let you up...head your way to the blue door where Griffin will see you once in there will be a gated door where the Weapon shop is the woman will let you know whether your worthy to come in or not, if she approves you get the achievement and also some pretty sweet weapons with full ammo....tho the next chapter will load up and these weapons are useless.
*Bonus*
If you get this achievement between the 2 weapon shelves on the right is a Chicken wearing a pirate hat press (X) it will burst into flowers. On this same Chapter there are 3 Ammo boxes that when you try to go for them they fall off the cliff when done they unlock a funny clip as well as the powerful "Cluckshot"...first ammo box is on the hood of a car hanging off the edge. Second ammo box is hanging off the edge of a railroad tracks. And third is after you find out the Cable Car is locked down after all the Formers run out of the building after you if you head past the entrance and go straight there is the last ammo box you try to kick it down but it falls of the edge...The Pirate Chicken is called in for Air Support riding on a ship built with ammo boxes...It will then release 4 Cluckshots for your use...if you Super Reload it will shoot out 1 chicken that will scatter into 3 explosive chicken shots....Thanks IBACKBREAKER for showing this too me as well as Rooster Teeth for their video,,