It is indeed the only tough trophy in the game, no room for big mistakes. Not really a walkthrough, but there's a video (broken up in many parts) on youtube of a Japanese guy completing the game in 1 hour and 32 minutes. 100% legit, fair and square. I watched that video at the same time I was playing and basically mimicked everything he did (almost everything, some things required either practice or too much skill to pull off xD) and I got it on my 1st attempt.
