Record of Agarest War Zero

There is no way to track the amount of battles you have played however you can get a rough estimate of where you are at through title(s) 9-14. There is no way you will earn this trophy even after all the title grinding you will have to make time to earn this and "Fight in the Shade". You can earn both trophies at the same time so long as you pick a spot with at least 4 enemies that spawn upon battle (4 x 2500 battles = 10,000 kill enemies), when selecting the spot you can press to auto battle and let your CPU grind out the rest of the kills and battles for you while you do whatever.

Turbo Controller Method:

If you have a controller, fightpad, fightstick or anything with a turbo feature on it you could also set the turbo on and tape the button down so that the game automatically goes into battle for you for a period of time. The only thing you would have to worry about are level ups but if you are using your top level team you shouldn't have to worry about that. You can leave the game on overnight and wake up to possibly 1 or 2 trophies.