Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Like A Boss (25 points): Win 5 online ranked games in a row.
Welcome To The Jungle (10 points): Play an online ranked game.
Time For A Montage (25 points): Play 15 online ranked games.
Don't Stop Believing (25 points): Beat an online ranked opponent with a skill level of at least 5 above yours.
2 Points 1 Win (10 points): Convert all 2 point attempts and win, Points To Win 30, Number of Downs 4, Start On Own 20.
Learn To Share (10 points): Commit no turnovers in a game, Points To Win 30, Number of Downs 4, Start On Own 20.
It's All Downhill From Here (20 points): Score on the first play of the game, Points To Win 30, Number of Downs 4, Start On Own 20.
You Can Dance If You Want To (10 points): Force a safety, Points To Win 30, Number of Downs 4, Start On Own 20.
Play Them Out Keyboard Cat (25 points): Hold your opponent to 0 points, Points To Win 30, Number of Downs 4, Start On Own 20.
Buzz The Tower (10 points): Win the game with only passing plays, Points To Win 30, Number of Downs 4, Start On Own 20.
Return To Sender (20 points): Score a defensive touchdown, Points To Win 30, Number of Downs 4, Start On Own 20.

Additionally, there is one secret achievement:

Games Don't Grow On Trees (10 points): View the game credits.