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