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