To unlock the "Kickin' The Balls" achievement you must kick a soccer ball 100 times. To do this easily, use the soccer ball located outside and to the right of the Boys Dorm. Go to the right-hand side of the dorm and repeatedly kick 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.