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