Halo 3 Achievement help?

[Mystic Demon]

i need 3 more ppl that can log in a geust profile that can play team mystic with me to get achievements like the perfection medal so all we do is kill the geust profiles to get the achievements
gt is PitifulAsp add me if u want in

 

[Llama man]

ill help u get the achievements, add me im llamalover48, ill prolly be on tommorrow, ill join ur game over xbox live