Unlock Microsoft Gamerscore points by completing the following Achievements.

Achievement	How to unlock
A friend in need	Play an online multiplayer game.
A Friend Indeed	Finish all levels in the campaign in multiplayer online mode.
A Lady with an Attitude	Rescue Marie d'Ibelin.
An Honorable Enemy	Defeat muzafar.
Arsenal	Find all collectible weapons in the game.
Beast Slayer	Defeat the beast.
Bull Rush	Hit 4 enemies with your charge attack at the same time.
Byzantine ways	Complete the Arena.
Charge!	Acquire all Charge skills for Celian.
Chronicles of the Temple	Collect all Templar Chronicles.
Crowd favorite	Complete all bonus objectives in the Arena.
Daggermistress	Acquire all Dagger throw skills for Marie.
Dance of blades	Kill 15 opponents with Cyclone strike in the Arena.
Dedicated	Complete all bonus objectives on all levels.
Destructive	Smash 5 enemy shields.
Down, boy!	Save your partner from a dog attack.
Elite Gladiator	Complete the second Arena round without taking damage.
Executor	Finish off 30 fallen enemies.
Expert Tracker	Successfully track 20 trails to their end.
Fight back	Succesfully perform 10 counter moves.
Friday the 13th	Survive the events of Friday the 13th.
Gladiator	Complete the first Arena round without taking damage.
Healing hands	Heal your partner with the Mass Prayer skill.
Juggernaut	Advance a character to 5 health orbs.
Just a flesh wound	Finish a whole level without both characters dropping below 1 health orb.
Long Ranged	Kill 20 enemies with a ranged attack.
Look out below!	Kill an enemy by knocking him from a ledge.
Master Gladiator	Complete the third Arena round without taking damage.
Miracle Worker	Use the "Revive" action to help your teammate.
No escape	A fleeing enemy is killed with a siege weapon by you or your partner.
No Stone Unturned	Destroy a breakable wall.
Not a Scratch	Kill 5 enemies in less than a minute without taking damage.
Observant	Discover a clue.
Pyromaniac	Set 50 objects on fire.
Savior of Acre	Survive the siege of Acre.
Siege Operator	Kill all opposing squads with a siege weapon.
Silent and deadly	Perform 50 stealth kills.
Strenght of two	Finish a level in an online multiplayer game.
Team Tactics	Kill an enemy grabbed by the other character.
Templar Grand Master	Complete all levels on hard difficulty.
Templar Knight	Complete all levels on casual or higher difficulty.
Templar Master	Complete all levels on normal or higher difficulty.
The Cup of Christ	Find the Grail.
The Duelist	Win a duel.
The Hero of Cyprus	Rescue the messenger of King Philip.
The Lost Temple	Explore the Temple of the Nine.
Thorough	Complete all bonus objectives in a single level.
Treasure hunter	Discover all chests in a single level.
Vigor	Advance a character to 5 stamina orbs.
Wardrobe	Find all collectible outfits in the game.
Watch Your Step	Disarm a Bear trap.
What was that?	Distract and then stealth kill an enemy.
Whirlwind strike	Hit 4 enemies with your all-around attack at the same time.