Here is the full list of all 25 Super Mega Baseball: Extra Innings achievements worth 1,000 gamerscore.
You won a season game at Ego 99.
You won a championship while playing at Ego 80 or higher.
You won a season game in extra innings.
You overcame a 5 run deficit to win a season game.
You pitched a complete season game with a single pitcher without giving up any runs.
You caught the batter looking for a 3rd-out strikeout with the bases loaded.
You won a season game at Ego 90 or higher.
You hit a homerun over 500 feet.
A player on your team struck out 4 times in a single game.
You won a season game at Ego 80 or higher.
You capped your successful season with victory in the playoffs.
Your hard battle through the season rewarded you with a playoff spot.
A player on your team led the league in batting average at the end of regular season play.
A player on your team led the league in homeruns at the end of regular season play.
Players on your team led the league in each of AVG, HRs and RBIs at the end of season play.
You hit a homerun with the bases loaded.
A player on your team hit a single, double, triple and a homerun in a single game.
You crushed the batter's hopes by climbing the wall to snag one out of the sky.
You hit the ball with a perfectly timed power swing (99 swing score).
You got two outs on the same play.
You hit a homerun.
Hit a total of 500 homeruns.
Modify a player on your team to have a rating of 90 or higher in each of Power, Contact and Speed.
Modify a player on your team to have a rating of 90 or higher in each of Arm, Fielding and Speed.
Strike out a total of 500 batters.