The Legacy of the First Blade - Episode 1: Hunted Add-on for Assassin's Creed Odyssey has 5 achievements worth 110 gamerscore.
Kill the Makedonian lion.
Land a Rush Assassinate that chains 4 times with the Pride of the Lion.
Discover the truth about Darius's past.
Kill all of the Ancients in the Order of the Hunters in Makedonia.
Kill 10 enemies using the Death Veil ability.