Operation Flashpoint: Red River

This is the Achievement 'Rule #8' keep the enemy suppressed. Now the Quick way to do this is to be the Fire Team Leader then choose the Suppress option (RB, down, down) and press it 5 or 6 times during the same mission. you can do this on the same spot and get the achievement. Remember you MUST be the Fire Team Leader. Hope this helps

Edit: here is the video I made, as it was requested by a fellow YouTuber, Hopefully it will clear up anymore issue's.