I have discovered a method that pretty much guarantees you a win, if you have a decent team at least. I don't know if this method will get you banned or not because I haven't played through a season yet.
What you have to do is create a lineup where all of your starters are a very low OVR. Then put your best players as their backups. For example, I had the punter be my quarterback then had 95 Peyton Manning as his backup. Because the matchmaking works by OVR, this will match you up with very low teams. Once you find a game, wait until after the kickoff, pause the game, go to your Depth Chart and press Y. This will make your roster play your best players. Now you will easily bulldoze these teams. I had to bump my OVR to 55 because I wouldn't find anyone at 47.
So far I have played three games doing this and each team didn't have a player rated higher than 65. I will update this if I run into any problems and/or after my SB win.
UPDATE: The first season I did this method, I got disconnected in the last game before the Super Bowl, so I had to play a whole new season.
In the second season I noticed I started to play better teams, even though I still won, these teams were around 80 OVR. To combat the game noticing this I would change a player in my lineup and exit the whole game itself. The next game always gave me the low OVR teams again. I had to do it after every 3 games, it's completely up to you how often you do this.
This method did not get me banned.
The achievement will pop right after you win the Conference Championship game.