No missable achievements (plus 34 unknown)
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Extinguish 30 torches
Finish the introduction
Kill 50 enemies without making noise
Unlock 20 doors
Finish Mission 1
Kill 20 enemies in duel
Kill an enemy with a covered kill
Kill an enemy by poisoning the food
Eliminate 200 enemies
Create 30 clones
Let 15 clones die
Finish Mission 2
Drink 20 vials of amber
Kill an enemy with an aerial kill
No body found during a mission
Finish Mission 3
Pick pocket 15 guards
Finish Mission 4
Kill more than 40 guards with throwing knives
Give an orc one of your clones to eat
Finish Mission 5
Finish Mission 6
Kill two or more enemies by making a chandelier drop on them
Kill an enemy who was bound by a clone
Finish Mission 7
Eliminate a guard with a booby trapped clone
Kill a torturer in a duel
Gather all the treasures
Do not use any item during a mission
You looked at the World Tree a bit too long …
Manage to disable three guards, or more, inside a clone's smoke bomb
Unlock all skills
Unlock the Insignia of the Shadow for each mission