Prince of Persia: The Two Thrones

Story related. Cannot be missed.

Right after the second cart sequence (read above), you'll have to fight 2 bosses at once. As soon as the fight starts, focus on the one wielding a great sword. He'll parry your hits but this will make the second boss start a slow motion attack sequence. Simply dodge left or right to avoid his attack. His weapon will get stuck on the ground allowing you to hit him while in that state. As you do, watch out for the other boss as he'll still be free to attack you. Once his life bar hits the middle, your screen will flash, allowing you to start a Quick Time Button sequence that will halve the other boss's life bar, making them equal. Now repeat this tactic once more till another Quick Time Button sequence is prompted which will end the fight. The trophy will unlock soon after the boss fight.