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