Its very simple. When the mission begins, go through the far left portal. Make your way to the boss on the far right of the map (use your mini-map to see where you are going) and kill only the bird things (Star Light, ect.) along the way. Once you get to the last boss, kill it and everything that spawns after its death. Next, make your way back to the first boss, killing all of the other bosses and enemies along the way. One you reach the last boss (the Celestial Kirin, I believe) there should be some enemies that spawned after the other bosses' death's, but they shouldnt be a problem. Just focus your attacks on the last boss, and you should win. With all of the bird-like enemies gone, these fights should be a piece of cake.
P.S. This is a guide for Standards Reward, but, if you're like me, you just want to beat Factions!
