The Descent Add-on for Call of Duty: Black Ops III has 10 achievements.
In Gorod Krovi, complete Time Attack: Round 20.
In Gorod Krovi, launch 10 zombies into the air at the same time.
In Gorod Krovi, complete all solo Trials in one Zombies game.
In Gorod Krovi, kill 10 zombies at once with the Guard of Fafnir.
In Gorod Krovi, kill 8 zombies with a single Dragon Strike.
In Gorod Krovi, use the Gigant Beam to kill 20 Zombies in one activation.
In Gorod Krovi, the one must be freed.
In Gorod Krovi, wield the Gauntlet of Siegfried.
In Gorod Krovi, complete a Lockdown Event.
In Gorod Krovi, ride a Dragon.