Here is the full list of all 30 Sephirothic Stories trophies - there are 14 bronze, 9 silver, 6 gold and 1 platinum.
Obtain all the trophies.
Watched the opening.
Went looking for Magus.
Fairy joined the party.
Marnie grew up.
Rachel and Tabitha joined the party.
Defeated the evil Magus.
Earned the Normal End.
Earned the True End.
Walked 5,000 steps.
Walked 25,000 steps.
Walked 50,000 steps.
Defeated 100 enemies.
Defeated 600 enemies.
Defeated 1,200 enemies.
Created fusion 10 times.
Created fusion 20 times.
Created fusion 30 times.
Achieved 15 consecutive hits.
Achieved 30 consecutive hits.
Achieved 50 consecutive hits.
Synthesized a weapon to level 11.
Synthesized a weapon to level 25.
Synthesized a weapon to level 50.
Cleared 5 subquests.
Cleared 10 subquests.
Cleared 20 subquests.
Collected 45 treasure chests.
Collected 80 treasure chests.
Collected 110 treasure chests.