Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Big Game (20 points)	Kill Oz with a Lynx in Descent.
Coast 2 Coast (20 points)	Cross the water with a teleport grenade in Descent.
Double Tap (50 points)	Defeat Oz for the last time in Descent.
How the mighty have fallen (20 points)	Defeat Oz…again in Descent.
K.O. (20 points)	Punch 20 enemies with a Goliath in Descent.
Nah, I'm good (20 points)	Reach round 7 without anyone opening a door in Descent.
Reunion (50 points)	Complete Oz's challenges in Descent.
Size DOES matter (20 points)	Punch Oz with a Goliath in Descent.
Smooth Operator (10 points)	Defeat Oz in Descent.
Trick Shot (20 points)	Kill 100 enemies behind you with the KL03-Trident in Descent.