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