Great way to get this without a boosting partner or extra xbox.
Start a cloud franchise and have another profile created and linked with EA (I did use the 49ERS 99 overall roster listed in the walkthrough of this however I believe this should work with any team). After this invite your new profile to the league you just made, since I used the 49ers I made my other profile the Cardinals to match the week 1 matchup, I even tested to see if it would work in pre-season and it does. Once the new profile is in the league switch back to your main, fast forward to whenever you and that other team play, then go to the settings tab and scroll down to the users, as the commissioner of the league you can set the other profile to autopilot. Set the weeks of autopilot to however many it takes for you and the other profile to play a game, set the game quarters to 1 minute, then ,if needed, advance weeks till you play the other profile. The autopiloted team shouldn't need an invite or anything to play so start the match, play the game in full or super sim it after scoring a few times and just make sure you win, after this once you get back to the franchise menu the cheevo should pop! :)
Honestly this is the same solution i posted with Madden 20 if anyone needed to go back and do that one too. Sorry for essentially the same thing twice but it still works like a charm!