So this was a concept that me and a few friends were thinking about: So the Master Chief Collection has a campaign for Halo, Halo 2, Halo 3, Halo 4, and Halo: ODST. What if there were rewards tied to each? This is what we think could work well:
Completing the campaign on Heroic or higher (Co-op or Singleplayer) -1 Gold Pack
Completing the campaign on Legendary - 1 Additional Gold Pack
Completing the game on Legendary Solo - An emblem representing that game (Halo Logo, Halo 2 Logo, Etc. ODST would be tough as there is already an ODST emblem. A gun skin maybe?)
This would give players a little something nice in the new Halo for their dedication to the series without putting people who didn’t buy/play MCC at a disadvantage.