Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Chapter 01	Complete chapter 01.	10
Chapter 02	Complete chapter 02.	10
Chapter 03	Complete chapter 03.	10
Chapter 04	Complete chapter 04.	10
Chapter 05	Complete chapter 05.	10
Chapter 06	Complete chapter 06.	30
Chapter 07	Complete chapter 07.	30
Chapter 08	Complete chapter 08.	30
Chapter 09	Complete chapter 09.	30
Chapter 10	Complete chapter 10.	50
Chapter 11	Complete chapter 11.	100
Collector III	Collect 48 ammo packs.	80
Collector II	Collect 24 ammo packs.	30
Collector I	Collect 12 ammo packs.	10
Coming of age	Get 3,000 xp.	40
Companion III	Get 30 kills with Lea's abilities.	80
Companion II	Get 20 kills with Lea's abilities.	30
Companion I	Get 10 kills with Lea's abilities.	10
Dashing through the snow	Kill ten enemies while sliding.	40
Demolition man	Kill five enemies only with barrels.	40
Getting Better	Buy your first upgrade.	40
Hunter III	Kill 90 enemies with your guns.	80
Hunter II	Kill 45 enemies with your guns.	30
Hunter I	Kill 15 enemies with your guns.	10
Secret deals	Find and collect three intellisnippets.	40
Sniper	Kill six enemies using a headshot from more than 50m distance.	40
Time flies	Kill 21 enemies while the time is slowed down.	40
True marksmanship	Get 31 headshot kills.	40