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