To make things easy, this can be done in private games (versus>custom>LAN>host) with second controllers and bots turned off
I did a game on team death match and 2 on gridiron and popped it so there’s no specific game type it needs to be done in and you can mix up the game types
As said by Trombonafide In the comments, execution is the quickest way to do all 3 maps
GoW Butters Pointed out that he needed to win to get progress. I won all the matches so I don’t know if just completing the map work but winning definitely counts
Flopsy86 has said that he had to do all 3 in one sitting to get it to pop, that is how I did it initially so it popped for me no issues. So might be best to do it that way to get it to pop stress free