Here is the full list of all 50 The Witcher 2: Assassins of Kings achievements worth 1,000 gamerscore.
Finish the game by sparing Letho.
Finish the game at any difficulty level.
Finish the game by killing Letho.
Complete Chapter 3.
Spare or save Saskia.
Save Síle from dying in the unstable portal.
Leave Síle to die in the unstable portal.
Help Roche rescue Anais from the Kaedweni camp.
Acquire the Mutant ability.
Finish all quests involing the destruction of monster nests.
Acquire the Sense of Magic ability.
Enhance abilities using mutagens at least five times.
Complete Chapter 2.
Kill the draug.
Stop Roche from killing Henselt.
Kill three foes at once by performing a group finisher.
Spare all trolls in the game.
Relive all of Auckes's memories in Dethmold's vision.
Collect 10000 orens.
Kill 500 foes.
Seduce Ves.
Defeat all opponents in the Kaedweni arena.
Acquire the Combat Acumen ability.
Tour the camp with Zyvik.
Complete Chapter 1.
Kill a foe by deflecting his own arrow at him.
Craft a suit of armor from elements of the kayran's carapace.
Achieve character level 10.
Kill the kayran.
Cut off a tentacle using the kayran trap.
Perform three successful ripostes in a row.
Find all additional information about the insane asylum's history.
Successfully sneak through Loredo's garden and find the component of the kayran trap.
Hire a craftsman to create an item.
Kill 10 foes in a row without losing any Vitality.
Win an arm wrestling match, a dice poker game and a fist fight.
Complete the Prologue.
Intimidate someone.
Kill more than one opponent using a single exploding bomb.
Hit Count Etcheverry using the ballista.
Use alchemy to brew five potions or oils.
Survive your 30th fight in the Arena
Survive your 5th fight in the Arena
Kill the dragon.
Finish the game while playing at the Dark difficulty level.
Achieve character level 35.
Roll five-of-a-kind at dice poker.
Sneak through the lower camp without raising the alarm.
Help Iorveth find the dagger needed to free Saskia from the spell that holds her.
Kill all the trolls in the game.