Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
And stay down!	Defeat Infected bosses.	50
Back door	Find an alternative route to the city.	20
Beast no more	Destroy the Beast.	100
Big spender	Spend 2500 coins.	40
Can't Stop Me Now	Purchase ten powerups.	40
Choo Choo	Ride the train to mountainside.	30
Collect other achievements	Collect other achievements.	100
Done and Dusted	Destroy 5000 enemies.	80
Fashion Icon	Purchase six hats.	40
Got the Medals	Complete all training levels.	25
Hunting season	Destroy 1000 enemies.	40
I am so Special	Activate special fifty times.	50
I'm not a Rookie	Complete first mission.	15
Is anyone there?	Answer the distress signal.	30
It was too late	Defeat hordes at Camp Delta.	15
Jimbo	Save Dallas.	20
Mean Machine	Reach level 10.	40
Meet And Greet	Unlock all characters.	50
On the house	Get first Powerup.	15
Skillfull	Purchase nine skills.	40
So much Power!	Get ten powerups during one play.	40
Stand the ground	Defend the Camp.	30
Straight A!	Complete all objectives in one level.	20
Take your medicine	Exchange vials for the first time.	20
They tried to ambush ME?	Defeat the Horde.	20
Wakey Wakey	Unlock Jackal.	30