The 2010 thriller Halo: Reach, the final entry in the series developed by bungie its possible that it will be coming to Xbox One someday. According the top Xbox boss Phil Spencer, Who said on a tweet that he would like to see Halo: Reach on Xbox One via Backwards Compatibility.
One User Asked if Reach Might be added to the Halo: The Master Chief Collection or if it might get its own Anniversary Edition similar to Halo: Combat Evolved and Halo 2. Spencer however did not respond to these points, instead he suggested its more likely to come via backwards compatibility.
Executive producer Dan Ayoub said back in 2014 of possibly bringing ODST and Reach to XBOX ONE some day. "I think enough people have asked it that we are thinking about it"
More about backwards compatibility:
Spencer teased that Microsoft is focused on launching the feature publicly in November. He said that he has seen the lineup of the games coming to launch and in the months ahead and that its a good list. The Feature Is Currently available to Preview Program members.