Epic Mickey 2: The Power of Two

This trophy is tied in with the side quests called 'Finding the Hidden Heroes' and 'Goofy's Fountain Mishap' and what's more, it must be done with Oswald to ensure you don't lock yourself out of the trophy Heroes of Wasteland. Once you complete Goofy's Fountain Mishap, choose to use the head of Oswald, and turn in photo's of Oswald to Seth in Mean Street South for 'Finding the Hidden Heroes'. In Episode 3 you can speak to Seth and confirm he will use Oswald to change his garden, speak to him again and then head to OsTown and take a snap of the statue of Oswald. Head back to Seth and show him the pic, the trophy will unlock afterwards.

To ensure you complete both side quests properly and ensure you don't lock yourself out of a trophy, see the Perfectionist Guide here: LINK for more info.