I lost all my H3: ODST avatar awards when that accursed Halo Wapoint update got released. It also no longer shows stats for the older Halo games on 360. Screw 343.
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I lost all of my avatar awards from every game. I had to restart my Xbox about 3 times to get them all back. Try that or try redownloading Halo WayPoint because the ODST awards should still exist in the hard drive. So you didn't really lose them.