An easier way to unlock this is by simulating.
Pick a decent 6 star team such as Alabama, then choose your opponent as a 1 star team such a Texas State. Have the difficulty set to Heisman and the Quarter Length to 15 minutes. After the coin toss, do a full simulation to the end of the game. By the end, your team should have at least 50+ points and you will unlock this achievements and
The Keep 'em Honest achievement in NCAA Football 13 worth 21 pointsGain 200 rushing yards and 200 passing yards in the same game (excludes Co-Op and Road to Glory).