Invincible Tiger: The Legend of Han Tao

As you progress through the game, you will unlock cards in your Book Of Knowledge on the bottom row that are your finishing moves. When you look at them, the describe the finishing move, but don't really tell you how to pull them off. Eventually though you will get one that once you beat on your opponent enough, a button will appear above their head and you just have to hit that button for it to perform a finishing move. While that is the easiest method, you will end up doing some of the other finishers without even realizing it as there's a throw one I've done numerous times and have no idea how I did it, but just did. You may have to go back and replay a stage or two in order to get 50, but just keep grinding away. Once you do your 50th one, the trophy will pop.