Grand Theft Auto: San Andreas – The Definitive Edition

This can only be unlocked after the mission "Tagging up turf" with Ryder. You can't do this in Sweet's court, as you can't start the challenge. You need to find one of the full courts first. One can be found by going north from Sweet's house, using the bridge to get to the nearby Cluckin' Bell. Directly to the west of the Cluckin' Bell is the court where I unlocked this. There is another court to the east of Sweet's house, literally next to the barbershop, to the east of it. The area is called Playa del Seville, if you take a look at the bottom right of the map.

Walk over the ball that's on the ground and then start the Challenge Mode by pressing . You need to move into and then shoot from inside the red markers each time. Don't worry too much about accurately placing CJ inside the marker. Once you've found the correct timing regarding , which is right after CJ's hands are over his head, keep it the same regardless of how far he is from the basket. After shooting, hold towards the basket, so CJ goes to get the ball ASAP and you don't lose time. You can see where the next marker is on the mini-map too, in yellow. That's helpful once you've made some shots and the markers start moving further and further away from the hoop.

Don't worry about the time either, there's plenty. The achievement pops once it runs out and provided you got 30 points or more.

Maybe it's just me but after an hour of trying I've switched the graphics mode to Fidelity, so that the game will be a bit slower. (Even on Series X)
And I've started shooting with instead of since my pointer finger was hurting from all that trying.
Got over 30 points right after the settings change.

Also for most shots I came to a complete stop before pressing so that I could have a better animation timing estimation.

My timing for releasing was somewhere between CJ's feet leaving the ground and before the ball leaving his hands. It's hard to tell the perfect time, since on many occasions I thought I've nailed it, but the game said I've missed.

And to repeat the basketball court location: just north of Sweet's house is a Cluckin' Bell and you should go 1 block west from there.

This one is not well explained. I completed this achievement by going to the courts above Sweets house across the Cluckin’ Bell and must be completed by activating the “Challenge Mode” . It’s timed and goes further in distance as your progress . Easiest method I found is Hold RT until CJs hands are above his head and let go fast . Takes a couple of tries but worth it . Hope this helps

i just found out a glitched that worked 90% of the times. if you are struggling with this, you can keep pressing lightly the RT button until it releases the ball, it scores most of the times no matter the position of the ball