Instructions
Start a new soccer game in "Kinect Sports."
Swing your left foot to kick the ball into the goal when you are close enough.
Swing your right foot to kick the ball into the goal when you are close enough.
Wait for a moment when the ball comes toward you in mid-air and you are near the goal. This is the trickiest part of the achievement, because you cannot control when the ball rises in the air.
Swing your head toward the screen to headbutt the ball into the goal, earning the achievement.