There are a total of 8 different Halo 4 Playlists in Halo MCC.
In order to get this achievement you need to complete 3 different playlists. Completing one playlist multiple times does not give you progress towards the achievement.It has to be 3 different playlists that are completed.Playlists:
The Covenant threat:
Missions: Dawn, Requiem and Composer on Normal difficulty
Missions: Forerunner, Reclaimer and Composer on Normal difficulty
Missions: Dawn, Shutdown and midnight on Normal difficulty
Not recommended playlists:
LASO Campaign: every mission in Halo 4 on Legendary with all skulls on
Easy Campaign: every mission in Halo 4 on Easy difficulty
Normal Campaign: every mission in Halo 4 on Normal difficulty
Heroic Campaign: every mission in Halo 4 on Heroic difficulty
Legendary Campaign: every mission in Halo 4 on Legendary difficulty
Of course you can take any combination of 3 playlists i have listed above.
some playlists will be completed by doing other achievements like:
and while doing this you will get: