's solution, he hints at an easier way to unlock this achievement. I have found the best way to do this and will try to explain it in simple steps: If you have already played a match, skip to step 3
1. Go to seasons in "play" tab in the main menu, choose "play match".
2. Finish the game without anyone quitting or disconnecting. Win or lose, the result doesn't matter, you just need to finish the game.
3. Once you are done and have played at least one game, choose "current season" from the Seasons menu.
4. Press A on the game you have played.
5. Choose the "History" option from this menu.
6. If the person has won at least one division title before, then two achievements will unlock, one for winning a division title and one for being promoted.
7. If the achievements don't unlock, then you will need to play another game, and then repeat the steps.
In summary, to get this achievement the easy way, all you need to do is to have played against someone who has won a title before, then look at their seasons history.
If you follow these steps, you can get this achievement after one game. Good luck