I've never actually played the Far Cry 3 co-op mode, but I'd like to just to get the last few remaining trophies. If anyone is interested in helping out/getting the trophies for themselves, just post your PSN name below. A headset is preferred for better communication, but not necessary. I'll be on around 12:30-1 AM when I get off work (It's 2 PM here now, so 10-11 hours).
it's actually pretty easy to get the trophies but you have to play a section all the way through. so you can't start a section that has been going already. having people that aren't morons also helps. i got them all within about 3 days of just playing co-op.
the other big thing is that you can play them on easy. it doesn't effect the trophies at all. so try to play from the beginning of the section, on easy, with people who aren't idiots.