The Season Nine Title update for Sea of Thieves has 5 achievements worth 150 gamerscore.
Conquer 3 Forts of Fortune.
Uncover a Skull of Destiny.
Use a Skull of Destiny to begin 3 Fort of the Damned events.
Hand in 30 Reaper's Chests or Reaper's Bounties.
Hand in 30 Chests of Fortune.