Perform a system cache if that doesn't work use Microsoft help.
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Achievements and avatar awards.
matchmade means that you can do it in matchmaking or on xbox live with a friend in custom games
after Halo reach,there is no more In total, there is :Halo 1,Halo 2, Halo 3, Halo ODST, Halo wars and Halo reach
No, Halo Reach shows what happened before Halo 1. In fact, in one of the missions in halo reach, you can see Master chief
halo,halo 2,halo 3,halo3 ODST,halo wars,halo reach