Here is the full list of all 13 Sumioni: Demon Arts trophies - there are 10 bronze, 2 silver and 1 gold.
Spent > 1 hr. in multi-edge mode in a single save slot.
Achieved all endings in a single save slot.
Achieved Ending 5.
Inflicted status ailment on 10 foes in a single save slot.
Achieved Ending 6.
Expanded life gauge to max.
Expanded ink gauge to max.
Achieved Ending 4.
Summoned lion Inkgod 30x in a single save slot.
Achieved Ending 2.
Summoned firebird Inkgod 30x in a single save slot.
Achieved Ending 3.
Achieved Ending 1.