Here is the full list of all 52 The Witcher 2: Assassins of Kings Enhanced Edition achievements.
Finish the game by killing Letho.
Kill the dragon.
Help Roche rescue Anais from the Kaedweni camp.
Bow to Death at a Winter Shrine.
Stop Roche from killing Henselt.
Kill all the 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.
Finish the game while playing at the Insane difficulty level.
Finish the game at any difficulty level.
Finish the game by sparing Letho.
Reach the Epilogue of the game.
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.
Achieve character level 35.
Complete Chapter 2.
Kill three foes at once by performing a group finisher.
Kill the draug.
Perform three successful ripostes in a row.
Sneak through the lower camp without raising the alarm.
Enhance abilities using mutagens at least five times.
Spare all trolls in the game.
Acquire the Combat Acumen ability.
Acquire the Mutant ability.
Acquire the Sense of Magic ability.
Kill 500 foes.
Collect 10000 orens.
Complete Chapter 1.
Craft a suit of armor from elements of the kayran's carapace.
Achieve character level 10.
Kill the kayran.
Cut off a tentacle using the kayran trap.
Brew the ostmurk potion.
Bow before the Sun at a Summer Shrine.
Use alchemy to brew five potions or oils.
Find all additional information about the insane asylum's history.
Kill more than one opponent using a single exploding bomb.
Kill a foe by deflecting his own arrow at him.
Drink one potion.
Successfully sneak through Loredo's garden and find the component of the kayran trap.
Hire a craftsman to create an item.
Win an arm wrestling match, a dice poker game and a fist fight.
Roll five-of-a-kind at dice poker.
Finish the Prologue.
Intimidate someone.
Kill 10 foes in a row without losing any Vitality.
Hit Count Etcheverry using the ballista.