The Lost on Mars Add-on for Far Cry 5 has 7 achievements worth 300 gamerscore.
Complete the game (Host Only).
Perform 10 takedowns on Arachnids using the Power Glove.
Collect all of Larry's notes (Host Only).
Kill all the Queens (Host Only).
Buy 12 weapons.
Hit 10 Arachnids with Crabmones.
Reboot the Terminal on top of the Control Center Antenna.