I honestly have no idea. I think my score is a litle over 7500 and other than me beating my games I couldn't tell you anymore (like performing however many headshots in a row kind of stuff). I can tell you Fight Night is really easy to beat and you get 1000 points for doing so. Just try to beat as many games as you can. I think Uno gives points quickly, the Tom Clancy games are easy to beat as well.
I'm kinda pissed that I didn't get any points for beating Saints Row because I used the ammo and sprint codes. Thats so stupid, its not like there's a God code in the game (that I know of). I still died a thousand times. That game is hard as nails towards the end, I needed those codes to even have a fighting chance.