Here is the full list of all 38 Dark Souls II achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Light all flames on the map in Majula
Inherit Laddersmith Gilligan's equipment
Learn all gestures
Discover the abysmal covenant
Max-out devotion to covenant
Discover an ancient covenant
Inherit Steady Hand McDuff's equipment
See the ending
Inherit Benhart of Jugo's equipment
Reinforce a weapon to its limit
Acquire Ashen Mist Heart
Defeat Vendrick
Acquire the King's Ring
Defeat Looking Glass Knight
Light the primal bonfire in Brightstone Cove Tseldora
Discover the covenant of rodents
Light the primal bonfire in the Iron Keep
Discover the clangorous covenant
Discover the covenant of the protectors
Light the primal bonfire in the Black Gulch
Discover a most brilliant covenant
Discover the covenant of the bloodthirsty
Light the primal bonfire in Sinner's Rise
Inherit equipment from the head of Vengarl
Defeat the Last Giant
Discover the covenant of the meek
Give Rosabeth of Melfia something to wear
Die for the first time
Discover the covenant of the fittest
Reclaim flesh and set out as an Undead
Earn all achievements
Learn all sorceries
Learn all miracles
Learn all pyromancies
Learn all hexes
Increase the population of Majula
Inherit Captain Drummond's equipment
Inherit equipment from Lucatiel of Mirrah