It's a pain, but not impossible, stop exaggerating. Defenders and Voidwalkers (Voidfang Vestments is your BFF) have the easiest time, since grenade/super K's count (charged melee might as well, can't remember) Void shotgun camp, FR spam, horde Heavy Weapon ammo, esp. machine gun. I ALWAYS get more K's with MG then rocket launcher. Don't run around like a noob and end up with a <1.0 K/D I solo'd Xyur the Unwed to finish that bounty... worse is yet to come