Here is the full list of all 35 Winter Ember achievements.
Pickpocketed 100 gold
Killed or knocked out 5 enemies within 5 seconds
Caused an enemy to slip
Created an arrow with two or more components.
Performed 10 stealth kills
Performed 20 stealth kills
Saved the civilians from being executed during the Evening Purge.
Killed an enemy with a log
Maxed out one of your skill trees
Set 5 targets on fire
Performed 5 stealth kills from cover
Caused Izyus, the High Priest, to fall from a height
Caused an explosive barrel to blow and damage Battista
Completed the game on Faceless Man difficulty
Successfully lockpicked 3 hard locks
Disarmed 5 bear traps
Collected all blueprints
Got the Closure ending
Got the Divided Nature ending
Got the Final Nail ending
Located Francis Toussaint
Completed all three mad scientist questlines
Used 5 rope arrows to climb
Sold 10,000 worth of items to the Black Market
Visited where your family rests
Got buried alive
Successfully parried 30 enemies
Knocked out 20 enemies
Knocked out 50 enemies
Hid 5 bodies in tall grass
Found all 10 feline paintings
Killed 30 enemies
Killed 50 enemies
Extinguished 50 light sources using water arrows
Killed 20 enemies with a throwing knife