The Legend of Heroes: Trails of Cold Steel

Just beat the game on Nightmare mode then you can unlock this trophy and Crown of Fortitude. It is recommended that you aim for this on your second playthrough since you can carry over your level and equipment from the first. The enemies have high stats and tend to attack weak characters first. If you start this mode on the second playthrough, then you can defeat most of the bosses easily except the final boss due to its solo combat and he has ton of HP. Please see Put to the Test to know the bosses' weakness spot. Rean's level should be at least 68 and the higher level he is, the easier it is to deal with the final boss.