Ocean's Heart achievements

Travel from Oakhaven to Goatshead Harbor in under 1:07 time without sailing

Travel from Marblecliff Monastery to the Cursed Temple without taking any damage or sailing

Upgrade then downgrade the flail

Summon and defeat the Crow Lord

Enter the Abyss

Learn all 4 ancient spells

Collect every item

Defeat arborgeists of the Ancient Groves

Complete every sidequest

Battle the Immortal Curse at the center of the world

Defeat Blackbeard while cursed

Fully power the Seabird's Tear