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