This Seeking Tech guide will explain how you can get the Thieving Opportunist trophy in Sly 3: Honor Among Thieves (2024) on PS5 and PS4.
To unlock this, you need to “pickpocket loot (excluding coins) with Sly, Bentley, and Murray.”
Use the following video as a visual aid:
This can only be done after you beat Episode 1, when Murray becomes playable.
Afterwards, you need to steal loot from enemies with shiny back pockets.
For Sly, you need to press Circle when you are behind the enemy.
For Bentley, you need to equip the Fishing Pole gadget and then pull it out of the enemy.
For Murray, you need to knock the enemy out, pick him up with Circle and then mash Circle until the loot is dropped.