Operation Flashpoint: Dragon Rising

Dragon rising is different to other FPS as like the box says one hit can kill. You need to be very carefull, check your horizons and don't get too close to enemies. Also bullets fall like in real life so if you are more than 100 meters away those funny lines and numbers in your scope finally come in handy, the further away you are the higher you should aim. Your fire sqaud is usefull for healing you and lends some fire support. There are a variety of orders you can use but if found i didn't use a whole lot of them and i managed the normal campaign fine. IT is difficult to issue order when you're being shot at and i often found as i tried to issue a tactical flank or advance i was either dead or incarcapated. So hopefully you'll use your fire team better than i did but this is the warning.

Co-op warning! If you are playing in a co-op game where someone else is host, this achievement will NOT pop for you. The achievement only seems to pop after the game's final cutscene, which does not play during a co-op session. I played through the entire campaign in co-op with my friend hosting, and we got every single mission achievement and side objective achievement. However, upon completing the game, neither of us received this one. My friend was able to go into his solo campaign, continue and trigger a final cutscene after which the achievement unlocked. However, since I was not host, I was unable to do the same, and ended up having to replay the entire campaign in solo, at which point I finally got the achievement at the end of the final cutscene.

Since nobody else has mentioned this, it is possible the achievement is a bit buggy and perhaps it does pop for some people who are not hosting in co-op. However, it certainly did not work for me.