I picked unc to do this achievement, but any 5 star school should work. Simulate the first season of dynasty to the offseason. After the mcdonalds all american game, you should see something on the calender that looks almost like binoculars. On the first Monday, look at all the top 100 players and sort by interest level in your school. Look for the players that have the mcdonalds symbol in the upper right hand corner, target them and select all the possible things you can (email prospect, watch highlights, etc...). If you pick prospects with a high or medium interest level this will help. Simulate to the next Monday and offer all remaining prospects a scholarship. Have a head coach visit them if you have available points. Simulate to the next Monday and the achievement should pop if you sign one. I started with 8 prospects and had 4 signed by the third week