Mitsuru Kirijo is a character from the ps2 game Persona 3; when I signed up here I didn't want to use my psn id for some reason, so I just used the name of one of my favourite characters from one of my favourite games (she's also the picture for my avatar, btw).
For the chests, I would say there's a chance that you might have missed one that you thought you got: I replayed levels several times for that trophy, and there was one chest that I never bothered with because I was certain I had already opened it, but then I broke it open one time and the trophy unlocked...Maybe that's what happened to you.
Of course, there are are a couple that are actually pretty well hidden, like there's one on the plane level that comes to mind...Anyways, I hope you can figure it out.
And if you want any advice on any specific portals feel free to ask and I'll try to help out if I can.
Ive actually finnished the game , just cleaning up and i know ive collected all the chest's but no trophy
I need the tresure fanatic trophy and all alfheim portal's trophy , but im finding those very hard ...