Full list of all 35 Nicktoons MLB achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Unlock all baseball cards
Defeat all the National League teams
Defeat all the American League teams
You won the Tournament!
You hit a home run with a pitcher
You won a 9-inning game in showdown mode
A single player accounted for 10 or more RBI in one game
Hit for the cycle
Hit a turbo home run in Frosty Freeze Field
Hit a Grand Slam
You hit a turbo home run in IRKEN FIELD!
Pulled off a Double Play
You won by only hitting singles
Hit a walk-off home run
Hit a turbo home run in Yolkus Stadium
Win a Distance Derby Round in Single Player
You Pitched a Perfect Game!
You hit a turbo home run in Ghost Zone Stadium!
You went six or more innings and allowed less than four earned runs with your starter
You earned at least 18 strikeouts in a single game!
You won a game by 10 or more runs!
Your starting pitcher went the distance in a 9-inning game!
Won a 9-inning game in a single-player game
Gain an RBI from a bunt
You chased the opposing team's starting pitcher in the first inning!
Load the Bases
You hit consecutive home runs with the same player in two at-bats in the same game!
Hit a turbo home run in Air Temple Courtyard
Earn a multi-hit game with one player
You won a Single-Player Game
You never fell behind
All starters on your team earned at least one hit in Single Player mode
Hit a turbo home run in the Poseidome
Throw a turbo strikeout
You had a 1, 2, 3 inning with a single pitcher