To unlock Xbox Live Gamerscore points, complete one of the following Achievements.

Achievement	How to unlock
A Precursor ( 5 points )	In the Poker Room of Prison, kill all 3 enemies with headshots before slo-mo ends.
Almost Halfway ( 10 points )	Attain Rank 10.
Art Collector ( 15 points )	Pin 100 total enemies with The Penetrator or Leaper knives.
Big Brother's Helper ( 15 points )	As Fettel, suspend 100 enemies that Point Man kills.
Completionist ( 50 points )	Complete every challenge at least once.
Dead Blind ( 10 points )	Spend an entire round of Contractions in deep fog without going into Last Stand.
Doll Collector ( 20 points )	Find the Alma Doll on every Mission.
Earl of Pain ( 10 points )	Kill 1000 enemies by any method in any game mode.
Extremist ( 20 points )	Complete any campaign level on INSANE without reloading checkpoints or going into Last Stand.
Footy Foul ( 10 points )	Kill 2 enemies with 1 Slide Kick during Slow Mo.
God Among Men ( 25 points )	Kill 250 total enemies during Slow Mo.
Handle with Care ( 20 points )	Return 30 crates in one game of Contractions.
Hanging 20 ( 20 points )	Complete wave 20 in Contractions.
Head Crab Removal ( 10 points )	20 kills with a crowbar.
I F.E.A.R. Nothing! ( 15 points )	Finish a wave of Contractions on INSANE without anyone going into Last Stand.
I'm not a Doctor, I'm a Medic! ( 10 points )	Perform 50 revives in any game mode.
Indecisive ( 10 points )	Possess 20 different enemies in one round of Soul King.
Insider Trading ( 15 points )	Possess every type of possessable enemy.
Little Brother's Helper ( 15 points )	As Point Man, kill 100 enemies suspended by Fettel.
Man Mode ( 100 points )	Finish the Campaign on INSANE difficulty.
Mission... accomplished? ( 50 points )	Finish the Campaign on any difficulty (all Intervals complete).
Monarch ( 20 points )	Win 20 rounds of Soul King.
No can defense! ( 20 points )	Kill 100 enemies with Jump Kick or Slide Kick.
Score Monger ( 30 points )	Complete 30 challenges in one Interval.
Soul Gatherer ( 15 points )	Attain a total of 6,000 Souls in one round of Soul King.
Soul Hoarder ( 20 points )	Attain a total of 25,000 Souls across all rounds of a Soul King match.
Spiritually Attuned ( 20 points )	Make 100 Psychic Links (Share or Steal).
State-of-the-art. Bang, bang! ( 20 points )	Kill 10 enemies in a row with Sniper Rifle headshots.
Supreme Challenger ( 25 points )	Complete 500 total challenges between all categories.
That's a lot of Zeros ( 50 points )	Attain a total of 250,000 points through challenges.
Unstoppable! ( 15 points )	Win all 5 rounds of a 5-round Soul King match.
We'll Try Again Tomorrow! ( 15 points )	Survive 3 waves in Contractions in a row without anyone bringing back a crate.
You've got the Touch! ( 25 points )	Attain Rank 21.