Despite the achievement description, ONLY "Every Race and Sport" works to unlock this, not the other two options. Set up a match just like you did with "Sunday League" but this time it will be every race and every sport in the multiplayer game mode. This will take a few hours.
It is suggested that you find two wired controllers, plug n' play kits, guitar or drum controllers. You will need two of any combination of those to leave your controllers active. All the games, races and vehicle selections are timed and the entire league will continue to play out while you can go to bed or whatever you need to do. The races are ten minutes each by themselves so this will need a few hours to complete.