What: “IT'S A BUST-ALL!” bronze trophy
When: During Year Three (The Pearl)
Where: The Pearl, Seabed
After you meet up with Meche and Domino, you will awaken in your new office. Head out and take the lift back down to the ocean floor, then head to the lower left (southwest) of the screen. You'll find plenty of workers here, but one in particular will be rocking away with a power tool. Speak to Chepito about his new weapon of choice and ask him how he managed to get it, among other things.
As with all of the other conversation trophies, if you don't ask the right questions before proceeding with progression, you can miss this trophy.