Here is the full list of all 50 Major League Baseball 2K9 achievements worth 1,000 gamerscore.
Unlock all nine cards for one team
Strike out a batter and throw out a runner on the same play (Hidden)
Get to the top of the Best of the Best ladder in Home Run Derby® Mode
Win the World Series® in Postseason Mode (Play Final Game)
Win the World Series® in Franchise mode (play at least 20 games)
Save 40 games in a season with one player (play at least 20 games)
Strike out 200 batters in a season with one player (play at least 20 games)
Hit 40 Home Runs in a season with one player (play at least 20 games)
Win 20 Games in a season with one pitcher (play at least 20 games)
Drive in 100 runs in a season with one player (play at least 20 games)
Hit 100 Home Runs with your User Profile
Hit a Home Run with Tim Lincecum
Drive in a run with a pitcher during a game (Hidden)
Hit a Home Run to win a game (Hidden)
Steal 50 bases with your User Profile
Hit 50 Home Runs with your User Profile
Steal 25 bases with your User Profile
Strike out 100 batters with your User Profile
Don't give up any hits in a game
Throw a No Hitter with one pitcher in a game (Hidden)
Hit a Home Run, a Triple, a Double and a Single in one game with one player
Steal Home
Hit 25 Home Runs with your User Profile
Strike out 15 batters in one game
Steal 6 bases in one game
Score 15 Runs in a game
Strike out 12 batters in one game
Steal 4 bases in one game
Hit three batters in a row (Hidden)
Win the Classic Home Run Derby®
Create a Card Team
Strike out 50 batters with your User Profile
Create a Player
Create a 2K beats Playlist
Strike out 25 batters with your User Profile
Hit four Home Runs in a game
Score 10 Runs in a game
Win a game without allowing any runs scored
Hit three Home Runs in a game
Try all 4 Practice Modes
Unlock all Achievements
Play a Ranked Online Exhibition game
Beat a Team 2K member or someone that has unlocked this achievement in an online game
Unlock all the pitcher cards in the game
Unlock all the batter cards in the game
Unlock one card on each of the 30 MLB teams
Unlock 10 Classic Player Cards
Unlock 100 cards
Unlock 200 cards
Unlock all 320 Cards