You might be able to get this while just playing, but if you're like me and play on rookie, the CPU doesn't seem to throw balls that often. I got this while going for
The Pitch Collector achievement in MLB The Show 21 worth 73 pointsDuring any plate appearance, see ten or more pitches (Excludes local multiplayer and practice). following
Maxumilli0n's guide.
I will not just copy Maxumilli0n's guide, so go there and copy the settings and sliders he says to use.
Once that's done, start retro mode. As the away team be the Dodgers, and choose the Rockies as the home team opponent.
Move your batter all the way up and inside. Attached (
https://imgur.com/joJHpUi) is a picture with what I believe is the strike zone. If the ball looks like it will land in the red you must try to foul. If you have the right sliders, swinging when the ball reaches the blue line will result in a foul. That's how I got the 10 pitches achievement.
So get two strikes or fouls, then try looking for balls in the green zone. Remember that if your batter gets hit he gets a free walk, so if a pitch is really far to the outside, pull your batter out of the way.
If you get the achievement, that means you are just one ball from a walk. So if you are also using the first batter of the inning, you can get
The Free Ticket To 1st achievement in MLB The Show 21 worth 36 pointsDraw a walk with the first batter of an inning (Excludes local multiplayer, franchise and practice). If you are having trouble, you can restart right from the pause menu.