To unlock the "Kickin' The Balls" achievement you have to kick a soccer ball 100 times. Use the soccer ball located outside and to the right of the Boys Dorm. Go to the right-hand side of the dorm and keep kicking the ball against the wall. If you wait until after 11 p.m. to do this, you can unlock the "Kickin' The Balls" and "After Hours" achievements in just two nights.