Pyro, if you still haven't finished it, we can do it later. Play with me and one other friend of ours.
For gold rush: We grab the idol and get it straight to the chests. The NPC's typically stay towards the middle of the map. So if one of us takes the idol and runs it around the outside of the map, it'll go fast, and safely.
Siege: Each person needs to man their own side. Typically that works best. Rather than everyone running from side to side looking for the NPC's. Even if your side is boring, don't leave unless you have to. Enemies can sneak in and it sucks when shottie guys sneak up behind you.
Survival: Pick the best spot in the map and everyone stays there. It often is the "good" siege spot. Then try the same idea as siege.
-Brutes show up in round 7. Saving their PAKs for other brutes/mini bosses is very important. Obviously when brutes and mini bosses show up, it's important to take them out quick. But, don't forget about the other enemies either.
-Everyone should have their "role". And have certain KB's that pertain to them.
That's a couple tips out of many lol. Your partners should know you're going for that trophy. Don't revive them unless you're positive you can do it safely. If they're trying to help you, they won't mind dying so you don't.
You'll get it man. I played a few crushing arena matches earlier. Strategize and it's a breeze.