The Reckoning Add-on for Call of Duty: Advanced Warfare has 10 achievements worth 250 gamerscore.
Defeat Oz for the last time in Descent.
Complete Oz's Challenges in Descent.
Kill Oz with a Blunderbuss in Descent.
Kill 100 enemies behind you with the KL03-Trident
Defeat Oz... again in Descent.
Punch Oz with a Goliath in Descent.
Defeat Oz in Descent.
Punch 20 enemies with a Goliath in Descent.
Cross the water with a teleport grenade in Descent.
Reach round 7 without anyone opening a door in Descent.