Saturday my xbox one mcc did a sync, after the sync i lost More grenade kills on my multiplayer achievements!!!! like over 200 for the second time!!! My medals still have all my grenade kills, but the achievement keeps going down!! This has went on since May!!! No one will even reply from 343. Pathetic!!!! Oh, and the domination medals are still not working, in halo 2 and halo 3 you get awarded the medals, sometimes, but do not go to your MEDAL Count after the game