The The Seabound Soul Title update for Sea of Thieves has 8 achievements worth 75 gamerscore.
Sell the Tome of Curses V.
Complete The Seabound Soul
Complete all commendations for The Seabound Soul
Sell the Tome of Curses I.
Sell the Tome of Curses II.
Sell the Tome of Curses III.
Sell the Tome of Curses IV.
Sell all 5 Tomes of Curses.