Halo 5: Enemy of my Enemy

Hey Guys,
I’m currently hunting the Halo 5 Achievements and “the Enemy of my Enemy” is the last one I’m missing.
I already tried to do this in 2 player Coop several times but this one is just to painful with the AI.
If there is anyone who wants to do this as well please feel free to add me. I would also be more than happy to help you out with other cheevos :wink:
GT: ipodolskyi