Game Master Achievement in Halo: The Master Chief Collection

The achievement's description here is quite self-explanatory. From the Main Menu, simply enter the Multiplayer Menu and then load up the Custom Games Menu. This will then allow you to choose whichever game, map and gametype you want to amend.

Once the following three choices have been made, you will enter the Options Menu where you can tinker with the session's gameplay options - such as general traits, weapon, and vehicle settings. You will want to change the settings (such as player movement speed) and press the right thumbstick to save the gametype name and file description. Now repeat this process four more times by changing other gameplay settings and the achievement will unlock.