Yes. It's not hard. Besides, combat arena is basically same as using GP's..infinite magic = could get 1000 hit combo with NW in seconds... lol. I got all but 4 trophies on normal difficulty playthrough. Just finished titan mode for 3 and getting the last trophy (don't die or fail in Labyrinth) on easy mode.
Yes, you can. I did. First concentrate on burning. Once get that trophy concentrate on blinding. Good idea to have save point at The Forum. Once done with game, load it up and whore firebow/Helios head for trophy.
Hounds, if you kick everyone that comes your way, will have trophy by the time you reach Poseidon's Chamber.