Here is the full list of all 19 Blacksea Odyssey achievements.
Unlock by ripping off 100 enemy weak points.
Unlock by beating the game in 60 minutes.
Unlock by completing the game.
Unlock by equipping three poison spear runes at once.
Unlock by collecting a bounty without taking damage.
Unlock by killing Charybdis
Unlock by equipping three fire spear runes at once.
Unlock by equipping three ice spear runes at once.
Unlock by killing every boss in the game.
Unlock by equipping three lighting spear runes.
Unlock by killing Leviathan.
Unlock by killing Cthulhu.
Unlocked by opening up 500 chests.
Unlock by killing an enchanted boss.
Unlock by having 20 items at once.
Unlock by beating Elite Mode.
Unlocked by completing the Bestiary.
Unlock by clearing all enemy zones in a level.
Unlock by beating the game with a score of 500,000 or greater.