If you're like me and created a player who can't rebound well enough to do this legit I've found an easy solution:
1) Get three other players who are willing to boost this achievement, as you need someone on your team to get assists with.
2) I recommend joining the Sunset Beach Ballers as there is three 2v2 basketball courts in MyPark while the Rivet City Roughriders only has one. If you're already apart of a different court you can switch affiliations in the MyPark menu.
3) Make sure each player in the session adds each other as a friend. Once someone finds a Park that has a free 2 on 2 court, the other players have to press
while in MyPark and go to "Play With Friends".
4) Make sure everyone in the game gets 5 points, 5 assists, and 5 rebounds. To get rebounds easily, take shots way beyond the three-point line or by intentionally messing up the shot release. Each player in the session should be able to complete this easily in one game if done properly.