The Lost Between Worlds Add-on for Far Cry 6 has 11 achievements.
Escape the Encasement with Fai's help
Collect all 5 Vessel Shards
Enter the portal and complete Fractured Fortress
Complete 5 consecutive rifts without using glints to respawn
Complete a run in Lost Between Worlds in 15 minutes
Take out 25 Defense Units with gadgets
Take out 10 Defense Units with melee attacks in one run of The Maze
Swim to a depth of 185 meters in Sunken Esperanza
Take out 20 Defense Units in one run of Death by Darkness
Blow up 30 Defense Units as Fai in Comandante Fai
Complete Color Combat without Dani's health falling to a critical level