DOOM + DOOM II

If you are on Xbox, you will need to plug in a keyboard to be able to type in cheats

Select any level on any Episode and type in "IDKFA" to get max ammo on every weapon, scroll to the Chaingun and just hold down the until youve fired every shot (200 Bullets) and the achievement will pop shortly after

Start any level, type "IDKFA" for max ammo (200), tap 4 for chaingun, hold down left click until empty and watch out for hearing damage!