Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Bridge Too Far (10 points)	The end of the line.
A Farewell To Arms (30 points)	You are relieved.
A Line, Crossed (10 points)	Choose vengeance.
A Line, Held (10 points)	Choose restraint.
A Man of Action (10 points)	Play it loose.
A Man of Patience (10 points)	Playing it smart.
Adapt and Overcome (20 points)	Blow up 10 explosive objects, killing at least one enemy each time. (campaign only)
Aim High (20 points)	Kill 250 enemies with headshots. (campaign only)
Airspace Control (20 points)	Kill 10 enemies while they use zip lines or are rappelling. (campaign only)
All You Can Be (20 points)	Complete any chapter with 60%+ accuracy without dying or reloading a checkpoint.
Applied Force (20 points)	Hit 10 enemies with your melee attack. (campaign only)
Army of One (20 points)	Kill 3 enemies with a single grenade. (campaign only)
Battle Management (20 points)	Kill 50 enemies using only the Attack Command. (campaign only)
Blind Luck (20 points)	Kill 5 enemies using blind fire. (campaign only)
Boot (15 points)	Complete game on "Walk on the Beach" difficulty.
Close Combat Carnage (20 points)	Kill 4 enemies with a shotgun in 10 seconds or less. (campaign only)
Damn Close (20 points)	Kill an Edged Weapon Expert while he is up to 5 meters away. (campaign only)
Damned if You Do (10 points)	Follow your orders.
Damned if You Don't (10 points)	Buck the chain of command.
Deer Hunter (20 points)	Kill an oryx. (campaign only)
Desert Storm (10 points)	Engineer an exit strategy.
Friendly Fire (10 points)	Show mercy.
Good Training (20 points)	Sprint into cover 10 times while under fire. (campaign only)
In Your Face (20 points)	Kick an enemy by vaulting over a cover. (campaign only)
Intel Operative (50 points)	Recover all Intel Items.
MFWIC (50 points)	Complete game on "FUBAR" difficulty.
Marksman - Grenade (25 points)	Kill 50 enemies with grenades. (campaign only)
Marksman - Heavy Arms (25 points)	Kill 150 enemies with any heavy weapon. (campaign only)
Marksman - Rifle (25 points)	Kill 350 enemies with any rifle. (campaign only)
Marksman - Shotgun (25 points)	Kill 75 enemies with any shotgun. (campaign only)
Marksman - Small Arms (25 points)	Kill 100 enemies with any pistol or SMG. (campaign only)
Marksman - Sniper (25 points)	Kill 50 enemies with any sniper rifle. (campaign only)
Preventive Diplomacy (20 points)	Kill an enemy just as they are throwing a grenade. (campaign only)
Recon (25 points)	Recover 12 Intel Items.
Sierra Hotel (50 points)	Complete three chapters in a row without being killed or reloading a checkpoint.
Situational Awareness (20 points)	Stun an enemy by dumping sand on their head. (campaign only)
Spotter (10 points)	Recover one Intel Item.
The Devil's Disciple (30 points)	Complete game on "Suicide Mission" difficulty.
The Great Escape (10 points)	Get out of here!
The Horror (10 points)	Face the horrors of war.
The Human Factor (20 points)	Kill an enemy by tagging him with a sticky grenade. (campaign only)
The Lost Battalion (10 points)	We have contact.
The Road Back (30 points)	Live and let live.
The Road To Glory (30 points)	Live and let die.
They Live (10 points)	What's lost is found.
Three Kings (10 points)	Stand united.
Too Late The Hero (30 points)	Carry on, soldier.
Treacherous Ground (10 points)	Look out below.
Unfriendly Fire (10 points)	Save a bullet.
We Were Soldiers (20 points)	Complete game on "Combat Op" difficulty.