Buy a full set of basic adventuring gear at your friendly neighborhood equipment shop.
Obtain the Power Ring.
Defeated Dularn
Defeated Dularn without taking any damage
Obtained the Shield Ring
Defeated Elfeilu
Defeated Elfeilu without taking any damage
Obtained the Small Shield
Defeated Girun
Defeated Girun without taking any damage
Defeated the Wyvern
Defeated the Wyvern without taking any damage
Obtained the Time Ring
Found the Plate Mail
Defeated Istersiva
Defeated Istersiva without taking any damage
Obtained the right to... buy... Brosha Serum
Obtained the Banded Slayer
Defeated the Harpy
Defeated the Harpy without taking any damage
Defeated Gildias
Defeated Gildias without taking any damage
Obtained the Battle Shield
Defeated Halvager
Defeated Halvager without taking any damage
Obtained the Battle Armor
Defeated Halabus
Defeated Halabus without taking any damage
Defeated Jilderos
Defeated Jilderos without taking any damage
Obtained the Protect Ring
Obtained the Flame Sword
Defeated Merland in Valestine
Defeated Merland without taking any damage
Fill out the entire equipment screen
Defeated Merland in Demanicus
Defeated Demanicus
Defeated Demanicus without taking any damage or equipping the Protect Ring