Hey how's it going! I'm also game to try to get both of these achievements. My GT: DDRHaloChief hopefully others are still looking to do these too. If you already got these then disregard my bad!
Marine - Iron
Made your first hot drop into HaloWaypoint.com
Halo 5: Guardians MP Beta participant.
View your Service Record on the web.
Become a member of an active Spartan Company.