Here is the full list of all 17 Bottom of the 9th achievements.
Complete the batting tutorial in Spring Training.
Defeat the Visiting Team in the Bottom of the 9th.
Complete the pitching tutorial in Spring Training.
Defeat the Home Team in the Bottom of the 9th.
Win a ranked multiplayer game.
Invite a friend to a multiplayer game and defeat them.
Win the Manager's Challenge in Classic Mode.
Win the Manager's Challenge versus the Easy Computer opponent.
Win the Manager's Challenge versus the Medium Computer opponent.
Win the Manager's Challenge versus the Hard Computer opponent.
Complete the Manager's Challenge with 4 or more wins and more than 25 MP.
Complete the Manager's Challenge with 5 or more wins.
Complete the Manager's Challenge with 6 wins.
Win the Manager's Challenge on Veteran difficulty or higher.
Win the Manager's Challenge on Hall of Fame difficulty.
Complete the Manager's Challenge after winning becomes impossible.