Minigolf Adventure (UP)

Simply wait until the arrow is at the top then press A to shoot the ball, this is a max power shot.
You will know when you do it right as a fire stream animation will be behind the ball.
Do this 20 times and the achievement is yours. This should come through natural play.

There is basically a much easier way then doing this yourself.

I got this by playing a Game of Hot Seat vs. CPU and the CPU really often uses Max Power. After i already finished the course and dont used Max Power the CPU had some strokes left and after he did some with Max Power the Achievement popped for me…