The final mission in Catwoman’s story is to retrieve your stolen items from Two Face. While this fight isn’t easy, it’s made easier once you know one specific piece of information: the thugs will respawn infinitely, so ignore them. Always go after Two Face. Get him isolated and use a takedown on him. It will take several takedowns to defeat him, but once you do, he will reveal that he gave your stolen items out to his henchmen.
Once you’re in free roam, you can switch between Batman and Catwoman at any time from specific points on the map (look for the pink cat icons). When you have control of Catwoman, use your Thief Vision and keep a look out for thugs that have a red gem icon on them. Taking those thugs down will slowly fill up a meter on the bottom of the screen.
Since the thugs are Two Face’s, you will only have to look in Park Row and the Bowery for them. As soon as you have taken down all of the thugs with the goods and your meter is full, this trophy will unlock.