First of all, league matches only count towards this so simulating cup, training & international matches WILL NOT affect this. However simulating too many league matches WILL.
Maintain good ratings during each league match, 7.0 - 8.0 either by having plenty of the ball, loads of successful passes, scoring goals or assists will easily get you a high rating each match. Getting MAN OF THE MATCH in atleast half of your matches and not simulating any more than 10% of your league matches should get you this award pretty easily.
Putting the difficulty onto BEGINNER should make this extremely easy, even to a novice of this game.
REMEMBER that the more league matches you simulate then the less chance you have of getting this achievement at the end of the season.