Very easy achievement. Start a Road To Glory and select "Create New Player". I chose to be a Quarterback (QB), my Home State at Ohio, and I chose Akron for my high school. Choose Freshman difficulty. I picked three 5 star schools as schools I'm interested in.
All you have to do is start each game, and simulate to the end of the game at the start. DO NOT simulate to the end of season or each week without entering the game, as the achievements will not count.
By the end of the season you should be undefeated and should win the High School State Championship. You should also be a 5 star prospect. This achievement should take about 10 minutes.
You'll unlock the achievement when you commit to a school. Thanks for reading, and enjoy the achievement!