Xbox Kinect and Halo: Reach Compatibility: Not Supported

The Xbox Kinect does not work with Halo: Reach. Both launched in 2010, but Reach was built entirely around traditional gamepad controls—Kinect support was never added.

Kinect launched with its own dedicated titles (Kinect Adventures, Dance Central, Kinect Sports) and later saw integration in games like Mass Effect 3 (voice commands) and Skyrim (shouts), but Halo: Reach remained controller-only.

If you want motion-controlled Halo, you'll need to wait for a future title (or try Halo: Combat Evolved Anniversary on PC with community mods—not official).