How To Unlock: Finish the 'The Last Hunt' mission having fired no more than 10 shots.
"The Last Hunt” is found in the challenge campaign. You have to finish the whole mission without firing more than 10 shots. Knifing enemies doesn't count as a shot. This is by far one of the hardest trophies in the game. Take your time to avoid enemies or try to knife them if you really need to kill them. Some people think that shots count up still even if you die, however this is not confirmed. By far the easiest way to do this is to do this on Easy, then only shoot is neccessary.