Here is the full list of all 11 Eternal Ring trophies - there are 6 bronze, 4 silver and 1 gold.
Create your 1st Ring.
Defeat the Water Demon.
Obtain the Fire Ball Ring.
Reach level 30.
Obtain the Fire Key.
Obtain the Sunbeam gem.
Obtain the True Sight ring.
Defeat the Wind Dragon.
Defeat Soulus' Bodyguard.
Obtain the Eternal Sword.
Obtain your 50th unique ring.