There are 51 Trophies that can be collected.

Bronze

Home, Sweet Home    
Score 193 runs with your user profile.    

Chicks Dig It    
Hit 74 home runs with your user profile.    

Almost There    
Hit 37 triples with your user profile.    

Fanning the Flames    
Strike out 514 batters with your user profile.    

Set the Table    
Hit 68 doubles with your user profile.    

Productivity    
Get 263 hits with your user profile.    

Domination    
Save 63 games with your user profile.    

Production    
Drive in 192 RBI with your user profile.    

You Make Your Own Destiny    
Steal 139 bases with your user profile.

Down But Not Out    
Get a hit with 2 strikes in a non-simulated game.    

Grab Some Pine    
Get a strikeout to end the inning in a non-simulated game.    

A Pitcher's Best Friend    
Turn a double play in a non-simulated game.    

To the Rescue    
Get a save with the tying run on base in a non-simulated game.    

Don't Call it a Comeback    
Win after being down by 4 after the 6th inning in a non-simulated game.    

The Start of Something Special    
Lead off an inning by hitting a triple in a non-simulated game.    

Stooges    
Strikeout all three hitters in the inning in a non-simulated game.    

No Hole too Deep    
Battle Back: Down 0-2, get walked in a non-simulated game.    

Throw First and Aim Later    
Miss your throw to first base with 2 outs in a non-simulated game.    

Take That    
Get an RBI after getting brushed back off the plate in a non-simulated game.    

My Main Squeeze    
Bunt the man home in a non-simulated game.    

Dual Threat    
Steal a base with a pitcher in a non-simulated game.    

I Came, I Saw…    
Hit a Walk-off Home Run in a non-simulated game.    

He Taketh Away    
Rob a Home Run by climbing the wall in a non-simulated game.    

State Farm®: The Road to Victory    
Get 3 consecutive batters on base in a non-simulated game.

The Goal    
Accomplish a Team Season Goal in My Player Mode.    

Back to the Cage    
Get a Golden Sombrero (strikeout 4 times in 1 game) in My Player Mode.    

Payback    
Hit a home run off a former team in My Player Mode.    

Your Day    
Win player of the game in an MLB game in My Player Mode.    

This is Why I'm Here    
Be successful in a major league clutch moment in My Player Mode.    

The Call    
Get called up to the Majors in My Player Mode.

You're Special    
Win a Season award in Franchise Mode. (play at least 20 games)    

Remember Me    
Break a record in Franchise Mode. (play at least 20 games)

King of the Hill    
Get to the top of the Best of the Best ladder in Home Run Derby® Mode.    

My Fellow Man    
Complete and win an online league game.    

Count it    
Complete and win a ranked match.    

Upset Alert    
Use the Houston Astros™ in a completed ranked match.    

The Spice of Life    
Play 10 ranked matches using 10 different teams.    

The Team to Beat    
Beat the St. Louis Cardinals™ in a completed online match.    

The Road to Greatness    
Complete and win 3 ranked matches in a row.

Silver

As Good as a Hit    
Walk 233 times with your user profile.

Mr. Consistency    
Get a hit in all 9 innings in a non-simulated game.    

A Virtue    
Face 10 pitches as the batter in a non-simulated game.

A Job Well Done    
Win 100+ games in a season in My Player Mode.    

2-Peat    
Win Back to Back World Series® in My Player Mode.    

The Top    
Become the #1 ranked player in your My Player organization.    

The Star    
Make the All-Star team in My Player Mode.    

The Hall    
Make the Hall of Fame in My Player Mode.

The Champs    
Win a World Series® in Franchise Mode. (play at least 20 games)

Gold

One Man Show    
Throw a No-Hitter in a 9 inning, non-simulated game.

What's Your Ring Size?    
Win a World Series® in My Player Mode.

Platinum

Walk Off    
Unlock all Trophies

http://www.ps3trophies.org/game/major-league-baseball-2k12/trophies/