The The Siege of Paris Add-on for Assassin's Creed Valhalla has 9 achievements worth 260 gamerscore.
Complete the Siege of Paris campaign (The Siege of Paris).
Complete all territories of Francia (The Siege of Paris).
Defeat all three Frankish Nobles (The Siege of Paris).
Reach maximum Infamy in the Rebel Missions (The Siege of Paris).
Enter the Assassin Bureau in Francia (The Siege of Paris).
Defeat the Ghost Auroch Boss (The Siege of Paris).
Kill an enemy with a scythe while wearing the full Reaper armor set (The Siege of Paris).
Pat all the cats in Evreux (The Siege of Paris).
Complete 10 Rebel Missions (The Siege of Paris).