Full list of all 38 Dark Souls II achievements worth 1,000 gamerscore. It takes around 80-100 hours to unlock all of the achievements on Xbox 360.
Inherit Steady Hand McDuff's equipment
Defeat Vendrick
Light all flames on the map in Majula
See the ending
Inherit Captain Drummond's equipment
Acquire Ashen Mist Heart
Acquire the King's Ring
Discover the abysmal covenant
Inherit Laddersmith Gilligan's equipment
Defeat Looking Glass Knight
Light the primal bonfire in Brightstone Cove Tseldora
Reinforce a weapon to its limit
Light the primal bonfire in the Iron Keep
Light the primal bonfire in Sinner's Rise
Light the primal bonfire in the Black Gulch
Max-out devotion to covenant
Increase the population of Majula
Inherit equipment from the head of Vengarl
Give Rosabeth of Melfia something to wear
Discover a most brilliant covenant
Discover the covenant of the protectors
Discover the covenant of rodents
Discover the clangorous covenant
Defeat the Last Giant
Discover the covenant of the meek
Die for the first time
Reclaim flesh and set out as an Undead
Earn all achievements
Learn all gestures
Learn all sorceries
Learn all miracles
Learn all pyromancies
Learn all hexes
Discover the covenant of the bloodthirsty
Discover an ancient covenant
Discover the covenant of the fittest
Inherit Benhart of Jugo's equipment
Inherit equipment from Lucatiel of Mirrah