This trophy is titled "Carpal Tunnel" and it's for playing the game for more than 25 hours. Game time counts from the second you've booted up the game until you shut the game down. In theory, you could simply leave your controller at the main menu for 25 hours and then play a fight and have an easy trophy. If you're going for the completion however, you won't need to sweat this one considering the fact takes over 30 hours easily between the Singleplayer and Multiplayer.