The Fort of the Damned Title update for Sea of Thieves has 5 achievements worth 55 gamerscore.
Clear the Fort of the Damned of all enemies.
Defeat each colour of Shadow of Fate.
Activate the Fort of the Damned by lighting all six Flames of Fate and sacrificing a Ritual Skull.
That shark bit off more than it could chew, when it chose to mess with you.
Clear the Fort of the Damned of all enemies, 10 times.