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