The The Crimson Court Add-on for Darkest Dungeon has 15 achievements.
Rescue someone
Collect The Invitation
Defeat the Baron
Recruit a flagellant
Get infected by the Crimson Curse
Defeat the Viscount
Defeat the Countess
Collect your first Trinket Set
Build your first district building
Build The Red Hook
Lose a hero to Wasting Away from the Curse
Kill an ally while under the Curse
Contract the Crimson Curse via contagion
Defeat the Fanatic
Have your entire roster affected by the crimson curse