Suppressive Fire! Achievement/Trophy GuideIn Mission 8 '
Hill 493' you will come to a section where you need to
push up a hill while a MG fires down upon you. Your objective here is to get your
engineer to the top of the map so he can
destroy the MG nest. To keep your guy alive you will need to
fire at the MG nest to suppress its fire then tell him to move up and after the
3rd move, a group of
enemies will spawn that you need to kill. Repeat the process now of suppressing and running then once he reaches the top this will unlock.
If he happens to die you can always restart the checkpoint and do it again.Here is a video guide: