That is one of my biggest complaints with some games with trophies; the tasks asked of you to do are either too easy to do for the trophy type or too hard to do. Also, a game needs trophy variety (stares at DW6: Empires) to make things interesting. I still think Uncharted has one of the best trophy lists available for any game, with the right amount of variety (for the most part) and "difficulty." For instance, DW6: Empires could've used something else besides the 43 bronze trophies that were just "complete a battle with this character."