The Mars' Chosen Add-on for Ryse: Son of Rome has 5 achievements worth 250 gamerscore.
Equip Your First Tier 6 Item in Multiplayer
Survive For 7 Minutes in Courtyard (Survival Mode)
Survive For 7 Minutes in Firestorm (Survival Mode)
Survive For 7 Minutes in Dockyard (Survival Mode)
Play a Round of Survival Mode on Courtyard, Firestorm, or Dockyard