Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Become Legend (150 points)	Reach Rank 150.
Grandpa's Automatic (25 points)	Earn a Gold Service Star with the M1 Carbine.
Small Crew, Big Job! (50 points)	Win 10 Squad Heist matches.
That's Not a Knife! (25 points)	Kill 25 enemies with the Throwing Knife.