I was winning 18-12 in the 6th period with like 10 seconds to go and the other team had the ball, and right before the period ended they scored and got the 1 point conversion and I got the achievement for some strange reason, so I actually lost the game 18-19. Can someone tell me why I got the achievement?

I think it is glitched. We played some games in local co-op on easy mode and after i started regulation mode game(in my very first time) and instantly received "Hundred Grand" achievement. :)

i ended up getting the acheivement finally in the last period before the game ended... the computer had the ball and ran with 4 seconds on the clock ... right after the snap and he ran 1 second the acheivement popped up.  We did tackle him and stopped him but anyhow the acheivement unlocked... best way to get it is score 3 touchdowns but for the extra point run the ball and get sacked so you explode... do it three times and win the game with solid defence plays.
Pick pitsburg and do safety blitz or those plays.. have yourself wait back for the computer to make a move and predict their defence.

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Yie Ar Feedle