Here is the full list of all 45 Major League Baseball 2K8 achievements worth 1,000 gamerscore.
Complete 10 games using advanced controls.
Throw out a runner attempting to steal a base (Pro difficulty or higher).
Win 20 ranked matches on Xbox LIVE.
Play a game in a league or tournament on Xbox LIVE.
In franchise, have a player win the Minor League Player of the Year award.
In franchise, have a rookie earn the Rookie of the Year award (min 20 games played).
Throw a Total Control Pitch with superb execution.
In franchise, have a player win the Player's Choice Best Hitting award (min. 20 games played).
In franchise, have a player win the Player's Choice Best Fielder award (min 20 games played).
Win at least 105 games in one season (min 20 games played)
In franchise, have your team make the playoffs (min 20 games played).
In franchise, have 3 or more players make the All-Star Team (min 15 games played).
Win a Strikes Only match on Xbox LIVE.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked a Top 'em achievement.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked 'Win 20 Online'.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked 'Legendary'.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked 'A Day to Remember'.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked 'Goliath'.
Top 'em: In a ranked match on Xbox LIVE, beat an opponent who has unlocked 'Earn 100 Cards'.
Win a Card Battle match on Xbox LIVE.
Win a ranked match on Xbox LIVE.
In franchise, win a game at each minor league level (A, AA, and AAA).
Throw out a runner at homeplate from the outfield using Right Stick Throwing.
Successfully prevent a runner from plowing over your catcher and scoring (Pro difficulty or higher).
Win a 9-inning game on Legend difficulty.
Get a Base on Balls (Pro difficulty or higher).
Complete at least 25 rounds of a fantasy draft in franchise mode.
Hit 5 home runs in one game (Pro difficulty or higher).
Get a line drive base hit using Right Stick Hitting (Pro difficulty or higher).
Score a run after plowing over the catcher at homeplate (Pro difficulty or higher).
Throw a no-hitter using any number of pitchers (minimum 9 innings, Pro difficulty or higher).
Hit two triples in one game (Pro difficulty or higher).
Successfully bunt for a hit (Pro difficulty or higher).
Complete a 9-inning game without giving up a home run (Pro difficulty or higher).
Unlock all the cards for a team in card series 1.
Create a complete card team.
Use your duplicate cards to buy a new pack of cards.
Unlock 100 different types of cards.
Get credit for a save (min 3 batters faced, Pro difficulty or higher).
Have your starting pitcher give up 3 or fewer runs in 6+ innings of work (Pro difficulty or higher).
Get credit for a hold (Pro difficulty or higher).
Turn 3 double plays in one game (Pro difficulty or higher).
Retire all 3 batters faced in an inning (Pro difficulty or higher).
Strikeout all 3 batters faced in an inning (Pro difficulty or higher).
Make a spectacular defensive play (Pro difficulty or higher).