This trophy is titled "
Egg on your Face" and requires you to unlock Chang Tzu and then use the Photo Mode to take a selfie with Chang Tzu.
In order to unlock Chang Tzu, you need to progress through the story mode until Lex Luthor appears in his Power Suit (Superman suit). Fly into the swamp (area with the Hall of Doom) and Chang Tzu should be waiting above the bridge that leads to/from East Gotham.
Speak with Chang Tzu to accept his mission to collect some items in the area. Follow the quest markers and retrieve the items. Return to Chang Tzu, drop the items into the designated spot, and this will complete the quest and give the option to purchase him for 500,000 Studs.
Purchase Chang Tzu, select him as a character, swap to the other character and enter the Photo Mode with L1. Take a photo with the Square Button to unlock the trophy.
If you want to see the unlocking video, here you go:
https://twitter.com/Vandel_Buster/status/1469944959272828928...