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