Here is the full list of all 27 Thieves Gambit: The Curse of the Black Cat achievements.
Become the world's most famous jewel thief.
Refused to join Bouchard.
Charmed the heir.
Succumb to the Curse of the Black Cat.
Started a romance with Bouchard.
Charmed the Duke.
Went in over the garden wall.
Start a romance with Rania.
Charmed the Duchess.
Went in disguised as a maintenance team.
Discover Nick's true identity.
Dance with Rania.
Escape the palace.
Double crossed Bouchard.
Teamed up with Bouchard.
Steal the Black Cat.
Revealed Ludomir Ivankov.
Went in through the front door.
Start a romance with Nick.
Investigate the palace.
Dance with Nick.
Recruited Nick.
Escape the city.
Recruit Le Roux.
Recruit Nora.
Recruit Rania.
Escape the Paris police.