This is another one of those that you can get by simming and combine it with other achievements.
First, start Dynasty (coach contracts on) and create a coach. Make sure that you set up your alma mater as one of these three schools. (I chose Texas State, but your choice.) Pick that school. You'll pop this as you advance:
The Dream Job achievement in NCAA Football 13 worth 52 pointsBecome the head coach of your alma mater in Dynasty (Coach Contracts on). TURN AUTOSAVE OFF.
I usually set custom conferences. Move your team to the SEC West so you play top-ranked opponents. Add USC (#2) and Oregon (#4) to your schedule.
Go to the Team Management tab and select Edit Rosters. Make your QB and 2 WRs all 99s. Might want to do your HB as well. I also make a DT and a CB 99 too... INTs and sacks slow them down.
If you've played this before, you probably know the next part. Go to Dynasty Setup and change the house rules. Skill and Recruiting to Freshman. Injuries and Fatigue off. Player Min Speed Threshold to zero, so your fast players outrun theirs. (Your X receiver should always get well past the defender on any long bomb play.) I turned off Home Field and Ice effects.
RB, Offsides off, Holding off. RB, all User stats to 99, all CPU stats to zero except punting, so you can gain more yardage on a drive (which will help your stats).
Now sim through the season, game by game. If you want to sim in a game you can, that way you can intervene if necessary. Long pass plays will do wonders, especially with your X and B receivers at 99.
Make sure you save before the championship game. Thanks to Yellow Screams for reminding me that
you have to play (and win) the BCS Championship Game. You can sim through as long as you make one play, but you have to go into the game and play it. If it doesn't pop for you, reload and replay the championship.
You should pop all of these at once:
The Hometown Hero achievement in NCAA Football 13 worth 103 pointsLead your alma mater to a National Championship as a head coach in Dynasty (Coach Contracts on). The Living Legend achievement in NCAA Football 13 worth 88 pointsReach a coach prestige of A+ with a created coach in Dynasty (Coach Contracts on). You might even pop the Heisman.
If you work on your recruiting, you can also pop these at the same time:
The Dual Threat Coach achievement in NCAA Football 13 worth 337 pointsWin the BCS Championship & have the #1 recruiting class in a single season as head coach in Dynasty.