The Clash in the Clouds Add-on for BioShock Infinite has 10 achievements.
Defeated all waves in The OPS Zeal.
Defeated all waves in Emporia Arcade.
In CitC, unlocked all Gallery items.
Defeated all waves in Duke and Dimwit Theater.
Defeated all waves in Raven's Dome.
In CitC, killed an enemy with splash damage by shooting a rocket out of the air.
In CitC, got a kill with each weapon and vigor (except Bucking Bronco).
In CitC, knocked an enemy off the city with Undertow, then rescued him, then knocked him off again.
In CitC, used all eight different vigor combos to deliver the killing blow on an enemy.
In CitC, completed all Blue Ribbon Challenges.