Here is the full list of all 50 I Am Setsuna trophies - there are 40 bronze, 7 silver, 2 gold and 1 platinum.
Obtained all trophies.
Fluxation occurred 200 times.
Defeated the Ruler of Time.
Listened to all the youth's lines and defeated him.
Defeated the Dark Samsara's final form.
Ate Gaia's Blessings Stew.
Obtained the Dragnarok spritnite.
Obtained the Rebellion spritnite.
Obtained the Doom spritnite.
Obtained the Gearadia spritnite.
Obtained the Eclipse spritnite.
Defeated all members of the Pengy species.
Obtained the Holy Light spritnite.
Obtained the Genesis spritnite.
Ate Nive Vegetable Stew.
Met the youth.
Met Eutess.
Defeated all the Spritnite-Eaten Monsters.
Saw the Moolbeld Ruins.
Sailed on the exploratory ship.
Ate Starberry Cake.
Ate Gatherington Fries.
Fluxation occurred ten times in Support Spritnite.
Used combos in Momentum mode 30 times.
Used one megalixir.
Defeated all members of the Hoot-Hoot species.
Saw ???.
Saw the Laniff Ruins.
Met Rhydderch.
Fluxation occurred four times in a single battle.
Inflicted 1000 damage in a single hit.
Added maximum Fluxes to a spritnite stone.
Met Sayagi.
Ate Horse Oak Casserole.
Met Cornelius.
Saw the Apparth Ruins.
Inflicted 500 damage in a single hit.
Made one monster drop eight materials at once.
Defeated ten enemies with Over Kill.
Fluxation occurred ten times in Command Spritnite.
Met Hydor.
Met Akash.
Defeated enemies with all Kill types.
Used Momentum mode 100 times.
Met Freyja.
Defeated ten enemies with Exact Kill.
Used Momentum mode ten times in a single battle.
Made one monster drop four materials at once.
Met Raishin.
Met Hapsper.