The endings trophies popped for you?
Yes. If you want to use my save, here you go:
CUSA23910
Use Slot 2 to get all endings:
File #12 (Miki's Face): A New Future & An Unchanging Future
File #01 (Serge's Face): The Developers' Room
File #02 (Kid's Face): The Acacian Empire
File #05 (Leena's Face): The Magical Dreamers
File #04 (Lynx's Face): The Shop Staff and the Three Unlikely Heroes
File #06 (Korcha's Face): The Rebirth of Marbule
File #07 (Glenn's Face): The Last Stand
File #09 (Viper's Face): The Viper Orphanage
File #08 (Riddel's Face): The Dark Fate
File #10 (Nikki's Face): The Dragon God's Revenge
In all save files you're right at Opassa Beach, just use the Time Egg on the beach's purple aura, let the party defeat the Time Devourer, watch the scenes and you're done.
Except for the 'Good Ending' where you have to use Chrono Cross item with all elements in right order.
Slot 1 has saves at various points during my gameplay that may help with other trophies.
But keep in mind no one of theses saves can unlock 'Get 99 stars' and 'Get 15 frames' trophies, I'm lacking these at the moment.