The Ruins of Brightholme Add-on for Sanctum 2 has 6 achievements.
Complete Brightholme.
Finish a map playing Skye with Collateral Damage, Bloodletter and Adrenaline Rush.
Reach rank 30.
Finish a map playing Sweet with the Long Range Specialisation, Core Guardian, and Long Range Superiority.
Finish a map playing TSYGAN with Rymdskor, Trickster and Parthian Tactics.
Complete Brightholme with 5 Feats of Strength enabled.