To earn this trophy you’ll have to complete every possible quest in a single playthrough. There are twenty-six side quests in the game, and you can complete twenty-four in a single playthrough. In Chapter 9 you’ll be able to complete three of five quests. One quest, Burning Thighs is universal, but The Party Never Stops and A Dynamite Body are exclusive to Chocobo Sam, while The Price of Thievery and Shears’ Counterattack are exclusive to Madam M. Choices you make throughout Chapter 9 will determine which of the latter two quests you receive. It doesn’t matter which two you unlock, as long as you complete them.
Should you complete all twenty-four possible quests, when you head to the “Urban Development District” en route to the end of the chapter you’ll find a letter on the ground. Pick it up to score an orb of Elemental Materia and this trophy.