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