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