Here is the full list of all 43 DARK SOULS III achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Complete all achievements.
Acquire all sorceries.
Acquire all pyromancies.
Acquire all rings.
Reach "The Usurpation of Fire" ending.
Acquire all miracles.
Learn all gestures.
Discover Mound-makers covenant.
Perform all forms of infusion.
Reach "To Link the First Flame" ending.
Discover Blade of the Darkmoon covenant.
Discover Aldrich Faithful covenant.
Defeat the Abyss Watchers, Lords of Cinder.
Discover Rosaria's Fingers covenant.
Reach "The End of Fire" ending.
Defeat Nameless King.
Defeat Ancient Wyvern.
Reach Archdragon Peak.
Defeat Champion Gundyr.
Discover Watchdogs of Farron covenant.
Reach the Untended Graves.
Defeat Oceiros, the Consumed King.
Reinforce a bonfire to the highest level.
Reinforce the Estus Flask to the highest level.
Reinforce any weapon to the highest level.
Defeat Lothric, Younger Prince, Lord of Cinder.
Defeat Dragonslayer Armour.
Defeat Dancer of the Boreal Valley.
Defeat Yhorm the Giant, Lord of Cinder.
Defeat Aldrich, Devourer of Gods, Lord of Cinder.
Defeat Pontiff Sulyvahn.
Defeat Old Demon King.
Defeat High Lord Wolnir.
Defeat the Deacons of the Deep.
Defeat Crystal Sage.
Discover Blue Sentinels covenant.
Defeat the Curse-rotted Greatwood.
Discover Warrior of Sunlight covenant.
Defeat Vordt of the Boreal Valley.
Discover Way of Blue covenant.
Become a Host of Embers for the first time.
Defeat Iudex Gundyr.
Light a bonfire flame for the first time.