Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Abomination	Defeat Abomination.	100
Antihero	Defeat Antihero.	100
Bot	Defeat Bot.	50
Buurieza	Defeat Buurieza.	100
Canine	Defeat Canine.	40
Chick	Defeat Chick.	10
Colossus	Defeat Colossus.	100
Fatty	Defeat Fatty.	15
Gamma	Defeat Gamma.	100
Gargantuan	Defeat Gargantuan.	100
Joyride	Defeat Joyride.	35
Loader	Defeat Loader.	25
Muscle	Defeat Muscle.	70
Nightmare	Defeat Nightmare.	100
Riot	Defeat Riot.	30
Skeleton	Defeat Skeleton.	20
Zombie	Defeat Zombie.	5