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