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