Pure Pool

Here's what I did:

Play a local 2 player match in 9 ball with the same controller. Let player 2 get all the balls in and just leave the 9 ball. Manage to get the 9 ball inches away from a corner pocket. Let player 2 foul the ball so you get exact placement of the cue ball. Put the cue ball next to the 9 ball and aim it off the back and towards your ball knocking the ball into the corner pocket. You'll know if you get it because you'll go into a cut scene and slow down showing you that you won. The achievement will pop during the cut scene.

The other guide only for pros. If the 9 ball local does not work. Like it did to me. Try 8-ball one controller local 2 players. And you will get it too. It not limited to just 9-ball as I found out.