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