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