Throw nine consecutive strike outs in season mode.
Big bat
Hit two consecutive homeruns in season mode.
EA Dream Team
Hold L1 and R1 and press Left, Right, Right, Right, X
Flaming baseball
Throw six consecutive strike outs in season mode.
Get Babe Ruth
If you win the world series with the red sox you get babe ruth you have to play the game when about to win so say if the series is tied up 3 to 3 play or 3-0 if you win you get him it won't say you unlocked a reward.
Get Cy Young
Start a season and play a game. All you need to pitch a 1 inning game and pitch a shut out and you will get Cy Young as a reward.
Hank Aaron
Hit two back to back homeruns in season play to unlock Hank Aaron as a free agent.
Hidden teams
Win the World Series in season mode. You can continue to play some hidden teams including The World All-Stars, Dominican Republic All-Stars, The Legends, and The Triple Play Team (who have big bats and hit homeruns 95% of the time).
Homerun sounds
While running around the bases after hitting a homerun, press Triangle to hear a soft horn, Square to hear a loud horn, or Circle to hear a whistle.
Large players
Hit a homerun with a player that weighs over 250 pounds.
Mike Schmidt/Jimmie Foxx
Hit 4 Homeruns in one game. The first time I did it I got Foxx, the second time I did it I got Schmidt.
Pencil head
Strike out six consecutive times when batting in season mode.
Points list
The game awards points for doing certain things in season mode. These points can be used in the season store to buy new stadiums, legendary players and better player attributes. The point system is as follows:
Event Points
Double 200
Triple 300
Homerun 300
Grand slam 400
Stolen base 200
Double play 300
Triple play 500
Strike out opponent 200
RBI 100
Win 100
Satchel Paige
Throw three consecutive strike outs in season mode to unlock Satchel Paige as a free agent.
Strong arm
Get caught stealing more than twice in one game in season mode.
Thin players
Hit a homerun with a player that weighs less than 160 pounds.
Ty Cobb
Hit two triples in one game in season mode to unlock Ty Cobb as a free agent.
Willie McCovey
Hit three consecutive homeruns in season mode to unlock Willie McCovey as a free agent.