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