Here is the full list of all 144 Out of the Park Baseball 21 achievements.
4 hit game
5 hit game
6 hit game
2 HR Game
3 HR Game
4 HR Game
Score 4 runs in a game
Score 5 runs in a game
Score 6 or more runs in a game
Get 8 RBI in a game
Get 10 or more RBI in a game
Strike out 10 batters in a game
Strike out 15 batters in a game
Strike out 18 batters in a game
Get 5 RBI in a game
Hit a walk-off HR
Hit a walk-off Grand Slam
Hit for the cycle
Closer strikes out the side
Pitch a shutout
Pitch a no-hitter
Pitch a perfect game
Score 6 runs in an inning
Score 10 runs in an inning
Score 15 runs in an inning
Score 15 runs in a game
Score 20 runs in a game
Score 30 runs in a game
Score 10 runs in a shutout
Score 15 runs in a shutout
Score 20 runs in a shutout
Bat around in an inning
Win the batter of the month
Win the pitcher of the month
Win the rookie of the month
Win the MVP
Win the pitcher of the year award
Win the rookie of the year award
Win a fielder of the year award
Win the hitting triple crown
Win the pitching triple crown
Have a player lead the league in BA
Have a player lead the league in HR
Have a player lead the league in wins
Have a player lead the league in ERA
Trade for a recent all-star
Trade for a recent MVP winner
Record an 8-game win streak
Record a 12-game win streak
Record a 16-game win streak
Reach the post-season
Sweep a playoff series
Reach the finals
Win the championship
Win the championship in a sweep
Win the championship on a low budget
Win the manager of the year award
500 Career Wins
1500 Career Wins
3000 Career Wins
Achieve a solid season score
Achieve a great season score
Achieve a top season score
Complete an Owner Goal
Successfully construct a dynasty for your owner
Complete all goals your owner tasks you with
First Game Win
First Series Sweep
First Quality Start
First Save
First Home Run
First Stolen Base
First Trade
First Free Agent Signing
First Draft Pick
First Contract Extension
First All-Star
First Player of the Week award
4 game HR streak
6 game HR streak
7 game HR streak
20 Game Hit Streak
30 Game Hit Streak
40 Game Hit Streak
50 Game Hit Streak
9 Game Run Streak
13 Game Run Streak
16 Game Run Streak
7 Game RBI Streak
10 Game RBI Streak
13 Game RBI Streak
20 Game Save Streak
30 Game Save Streak
40 Game Save Streak
10 Game Win Streak
15 Game Win Streak
20 Game Win Streak
Win the Reliever of the Year award
20/20 Player
30/30 Player
40/40 Player
Have the top vote-getter for the All-Star Game
3 DP in a game
5 DP in a game
6 DP in a game
Shared Shutout for the team
Combined no-hitter
Throw out 2 runners on the bases
Throw out 3 runners on the bases
Throw out 4 runners on the bases
Turn a Triple Play
Turn an unassisted Triple Play
Throw a 1-hitter
3 extra-base hits in a game
4 extra-base hits in a game
5 extra-base hits in a game
5+ PA with no official AB in a game
Hit a Grand Slam
Hit a leadoff HR
Walk-off hit
CG with no BB allowed
Win a silver slugger
CG Shutout on under 100 pitches
9-pitch inning with 3 strikeouts
Achieve a pitching game score of at least 100
Steal Home
Hit for a natural cycle
3 SB in a game
4 SB in a game
5 SB in a game
4 strikeout inning
Come back from a 4 run deficit to win
Come back from a 7 run deficit to win
Come back from a 10 run deficit to win
3 HR in an inning
4 HR in an inning
5 HR in an inning
6 hits in an inning
9 hits in an inning
12 hits in an inning
Score every inning
MVP of the All-star game
Strand the bases loaded
Have every player in the lineup get a hit