Not to take anything away from the other solution by BiLLzuMaNaTi it was too quick for me.
So I have uploaded my game clip to demonstrate how fine the adjustments are to place the ball in the correct position. I unlocked the achievement on my fourth attempt on the clip, after half an hour of trying.
Use the first level in region six. Position the right hand side of your cross hair slightly above the middle of the 5th brick on the wall to the left, then try adjusting until the ball bounces off the wall on the left, hitting the top edge of the platform on the right.
Hope this is helpful, keep fine tuning and you will get it eventually.