Complete any Campaign mission co-operatively on Heroic or harder. Is it too hard on Heroic?
I find having the "Grunt Birthday" skull on is helpful so you know when you killed grunts.
Use the Plasma Pistol + Scoped Weapon to take down elites.
There are passageways to avoid large fights, you don't always have to engage the enemy.
Against the Forerunners, attack those hovering robots (?) before attacking the Knights (?)
Vehicles are laying around for a reason, usually they're a better idea to use instead of going on foot.
Give your power weapons to marines, any weapon used by a marine will have infinite ammo.
It's better for you to drive instead of marines who are terrible drivers, but decent shots.
Don't go guns blazing together, if you have to, have one do it while the other acts as a "repawn point". --- PSN: Rutgers Student XBL: Jessica Jung xo Now playing Demon's Souls! (at this rate, forever)
lol thanks, but I don't have any problems playing the game. Just looking to nab to coop achievements. --- Remember this, if you see someone doing something but at the same time watching you... then he is a cop.