There are a few 'beat X in 1 minute!' trophies, and these are mostly for bosses which I would consider as spoilers. There is a reason why I unlocked Chaos difficulty early on. When you play on Chaos, you get used to attacking faster and you get stronger since you get more XP, SP, and Gald, so bringing the difficulty down to Easy, Normal, or Second would make these trophies ridiculously easy to get. I'd usually get the trophy on those difficulties first, reset and do the boss on Chaos to reap the SP/XP rewards.
Um. Gentleman Defeated! is the hardest trophy since you need to do all the Inn Requests (and thus you need to pay attention to some of the timed events like the handkerchief event) and get some drops to synthesize weapons/items.
The Zone Cage trophy isn't hard, and the cameo battle trophy isn't hard. The "beat Rock Gagan" trophy is one I'd advise doing after Future Arc, but it's possible to do beforehand if you grind.
The get 20/50/100 aliases trophies aren't difficult, but again--do the sidequests and go for some of the timed events to get the Titles you need.
There are trophies for clearing the game on various modes like Second, Hard, Evil, and Chaos. But all you have to do is just beat the final boss on those difficulty modes, not play through the game on those modes, so it's easy!
The 9999 points in the Arles Pot is easier than it sounds. Just keep using it and it'll get up there. It takes hours of grinding, though.
