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