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