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