Complete each achievement to get the allotted gamerscore.
When starting Hall Of Fame mode, certain parents will give you large boosts in key stats. If you want a receiver that is very fast, look for a hall of fame WR father with the note 'He was the Randy Moss of his time'. You should end up with 95 or higher speed. If you want a fast quarterback, look for a Pro Bowl or Hall of Fame QB father with the note 'He was the Michael Vick of his time'. You will be insanely fast and have good throwing power. Do not chose a father with the note 'He was his era's Tom Brady.' He will be extremely slow (55 or less speed) and not be able to outrun anyone..
When on defense, switch to one of the safeties in a zone coverage and pick up on a receiver. Stay about five to ten yards away from the receiver. When the quarterback throws the ball to that receiver, run towards the receiver. Press Y when you get in front of the receiver, just as the ball is getting there.
Enter Superstar mode and create a HB. During your workout, on the last one (the Running Back Challenge) just before you hit the goal line press B. He will start to do the spin but will not stop moving his feet very fast.
When you think one of your players may be injured on offense, hurry the play up and they will get back up.