Here is the full list of all 50 Major League Baseball 2K9 trophies - there are 42 bronze, 5 silver, 2 gold and 1 platinum.
Unlock all the pitcher cards in the game
Get to the top of the Best of the Best ladder in Home Run Derby® Mode
Unlock 200 cards
Strike out a batter and throw out a runner on the same play
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)
Unlock one card on each of the 30 MLB teams
Strike out 200 batters in a season with one player (play at least 20 games)
Drive in 100 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)
Hit 40 Home Runs in a season with one player (play at least 20 games)
Unlock 100 cards
Unlock all nine cards for one team
Hit 100 Home Runs with your User Profile
Unlock 10 Classic Player Cards
Steal 50 bases with your User Profile
Hit 50 Home Runs with your User Profile
Strike out 100 batters with your User Profile
Hit a home run to win a game
Win the World Series in Postseason Mode (Play Final Game)
Throw a No Hitter with one pitcher in a game
Don't give up any hits in a game
Strike out 15 batters in one game
Create a Card Team
Win a game without allowing any runs scored
Steal 25 bases with your User Profile
Strike out 50 batters with your User Profile
Score 15 Runs in a game
Hit four Home Runs in a game
Steal 6 bases in one game
Hit a home run with Tim Lincecum
Steal Home
Hit 25 Home Runs with your User Profile
Steal 4 bases in one game
Strike out 12 batters in one game
Hit three Home Runs in a game
Hit a home run, triple, double and single in one game with one player
Drive in a run with a pitcher during a game
Score 10 Runs in a game
Strike out 25 batters with your User Profile
Hit three batters in a row
Try all 4 Practice Modes
Win the Classic Home Run Derby®
Create a 2K beats Playlist
Create a Player
Unlock all Trophies
Play a Ranked Game Online
Beat a Team 2K member or someone that has unlocked this achievement in an online game
Unlock all the batter cards in the game
Unlock all 320 Cards