Unlock Microsoft Gamerscore points by completing the following Achievements.

Ale Iacta Est	Complete chapter 2.
Apprentice	Use alchemy to brew five potions or oils.
Artful Dodger	Cut off a tentacle using the Kayran trap.
Avenger	Finish the game by killing Letho.
Backbone	Craft a suit of armor from elements of the Kayran's carapace.
Being Witcher George	Kill the dragon.
Black Ops	Sneak through the lower camp without raising the alarm.
Craftsman	Hire a craftsman to create an item.
Dragonheart	Spare or save Saskia.
Eagle Eye	Hit Count Etcheverry using the ballista.
Fat Man	Kill the Draug.
Focus	Perform three successful ripostes in a row.
Friend of Trolls	Spare all trolls in the game.
Gambler	Win an arm wrestling match, a dice poker game and a fist fight.
Gladiator	Defeat all opponents in the Kaedweni arena.
Great Potion!	Brew the ostmurk potion.
Guru	Achieve character level 35.
Heartbreaker	Seduce Ves.
Intimidator	Intimidate someone.
Journeyman	Achieve character level 10.
Kingmaker	Help Roche rescue Anais from the Kaedweni camp.
Librarian	Find all additional information about the insane asylum's history.
Madman	Finish the game while playing at the Insane difficulty level.
Man of the Shadows	Successfully sneak through Loredo's garden and find the component of the Kayran trap.
Master Alchemist	Acquire the Mutant ability.
Master of Magic	Acquire the Sense of Magic ability.
Miser	Collect 10000 orens.
Mutant!	Enhance abilities using mutagens at least five times.
Necromancer	Relive all of Auckes's memories in Dethmold's vision.
Oh My God! You Killed the Kayran! You Bastards!	Kill the Kayran.
Old Friends	Finish the game by sparing Letho.
Once Ain't Enough	Reach the Epilogue of the game.
Perfectionist	Kill 10 foes in a row without losing any Vitality.
Pest Control	Finish all quests involing the destruction of monster nests.
Poker!	Roll five-of-a-kind at dice poker.
Reasons of State	Stop Roche from killing Henselt.
Ricochet	Kill a foe by deflecting his own arrow at him.
Sensitive Guy	Save síle from dying in the unstable portal.
Spellbreaker	Help Iorveth find the dagger needed to free Saskia from the spell that holds her.
Swordmaster	Acquire the Combat Acumen ability.
Taster	Drink one potion.
The Butcher of Blaviken	Kill 500 foes.
The Fugitive	Finish the Prologue.
Threesome	Kill three foes at once by performing a group finisher.
To Aedirn!	Complete chapter 1.
To Be Continued...	Finish the game at any difficulty level.
Torn Asunder!	Kill more than one opponent using a single exploding bomb.
Tourist	Tour the camp with Zyvik.
Trollslayer	Kill all the trolls in the game.
Witch Hunter	Leave síle to die in the unstable portal.