Image: Bend Studio / PlayStationOfficial screenshot from Bend Studio / PlayStation.
Mr. Fahrenheit is a Silver trophy for unlocking 45 skills, which is every skill in the game. You will be a few points short after the story, so finish the rest by clearing Hordes.
Finish the story and side content, then clear Hordes for the last few levels.
Clear Hordes after the story. They also give ears, trust and credits for other trophies.