13 3 0This isn't too hard with a second player. In fact, I highly recommend you run through each mission on Heroic with a second player. Keep in mind that as you start to go beyond the par time of the mission, your score and multiplier with begin to drop. Remember to turn on "Competitive score" in the mission select menu.For most missions, you may not need to activate any skulls. I only needed skulls on Kikowani Station and Coastal Highway. Every other mission I did without skulls on heroic. However, I recommend putting the Catch skull on just to be safe. For Kikowani Station I put on Catch, Famine and Tough Luck. You'll be in a Banshee for most of the mission so you and your partner should be able to double team the majority of enemies with little bother.For Coastal Highway I put Catch, Famine, Tough Luck and Tilt. The Tilt skull makes it so an enemy's resistance and vulnerabilities are greater respectively. For example, with this skull on, Brutes will absorb more damage from UNSC weapons than before and will be more vulnerable to plasma fire. Coastal Highway may be more difficult seeing as you'll be coming across a lot of enemies who will spam grenades at your vehicle. If you are playing with another person, have one of you get in the Scorpion when it shows up and the other stay in the Gauss Hog with Buck. Try to keep distance between you and the enemy when shooting. This level can be tricky at times, especially on certain sections of the highway. Try not to rush in guns blazing. Instead, go in slowly and scan the area for what you're about to fight. Banshees are usually very irritating, so you're going to want to target these first. When you get to the part where you see Phantoms flying past your left, you're going to want to shoot them down to give yourself some extra points. They fly quite fast so me and my friend were only able to get 3 out of the 4. For the end of the mission, one person needs to have rockets and the other needs to get on the top level and utilise the sniper and turret. Be careful if you're at the top though because the wraiths can still hit you.Hope this helps.