This is the way I got it : I was recruiting a kid throughout the season after a game mid way through he was a soft commit to another school. I Highlighted the kid and hit Y for more info. I was only 1 point behind the other school. So I spent a hour with him and negative recruited against the other team. The following week he committed to me and the achievement popped. This wont always happen tho, I had this scenario happen a few other times and they stayed committed to the original school.