Full list of all 43 Dark Souls III achievements worth 1,000 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Xbox One.
Reinforce the Estus Flask to the highest level.
Reach "The End of Fire" ending.
Defeat Champion Gundyr.
Reach the Untended Graves.
Defeat Nameless King.
Defeat Ancient Wyvern.
Reach Archdragon Peak.
Defeat Lothric, Younger Prince, Lord of Cinder.
Defeat Dancer of the Boreal Valley.
Defeat Oceiros, the Consumed King.
Defeat Dragonslayer Armour.
Discover Way of Blue covenant.
Defeat Yhorm the Giant, Lord of Cinder.
Discover Aldritch Faithful covenant.
Defeat Aldritch, Devourer of Gods, Lord of Cinder.
Discover Rosaria's Fingers covenant.
Defeat Pontiff Sulyvahn.
Defeat High Lord Wolnir.
Defeat Old Demon King.
Defeat the Deacons of the Deep.
Defeat Crystal Sage.
Defeat the Abyss Watchers, Lords of Cinder.
Discover Watchdogs of Farron covenant.
Discover Blue Sentinels covenant.
Defeat the Curse-rotted Greatwood.
Defeat Vordt of the Boreal Valley.
Become a Host of Embers for the first time.
Defeat Iudex Gundyr.
Light a bonfire flame for the first time.
Complete all achievements.
Reach "To Link the First Flame" ending.
Reach "The Usurpation of Fire" ending.
Reinforce any weapon to the highest level.
Perform all forms of infusion.
Acquire all sorceries.
Acquire all pyromancies.
Acquire all miracles.
Acquire all rings.
Learn all gestures.
Reinforce a bonfire to the highest level.
Discover Warrior of Sunlight covenant.
Discover Blade of the Darkmoon covenant.
Discover Mound-makers covenant.