Super Mega Baseball: Extra Innings

Quickest way to get this, is start a new season from the main menu. Select short season (16 games and best of 3 playoffs). Set ego to 0. For team, I used the Sirloins, but you should be able to use whatever team you like.

Play through the season. Important! Once a Game has started, do not quit out, or you will receive an automatic loss! If you get down by a few runs, don't sweat it, as it's real easy to come back in 0 ego mode. To qualify for the playoffs, you have to come in either first or second place in your division. If you lose a Game or two, don't worry, you should still be able to qualify for the playoffs. I lost my first game 1-0, because I could not get the hang of the hitting at first, lol. The second place team in my division was 10 wins and 6 losses, so you can lose a few games.

After the conclusion of the regular season, the achievement should pop, if you qualified.

the other guide is correct but just a slightly faster way is to start games and end them. you will get a loss but i only won 11 games and the other five i quit. i only needed 9 wins to make the playoff