Here is the full list of all 29 Dragon's Eye achievements.
The knight has acquired the Fire Sword!
The knight has acquired the Electric Sword!
The knight has acquired the Ice Sword!
The knight has acquired the Legend Sword!
The knight has completed the Fire Temple!
The knight has completed the Electric Temple!
The knight has completed the Ice Temple!
The knight found his companion!
The knight can now jump attack!
The knight can now throw the sword!
The knight found a Golden Dragon Eye!
The knight found the Red Dragon Eye!
The knight found the Purple Dragon Eye!
The knight found the Blue Dragon Eye!
The knight found a Spirit Orb!
The Knight found a Dragon Scale!
The knight has killed the Dragon and brought peace back to this world!
The knight has acquired the Talisman of Threat!
The dragon has burnt the knight to a crisp!
The knight found a health potion!
The knight found a stamina potion!
The knight has feasted!
The knight has found all dragon scales and turned them in!
The knight has prayed at the shrine and been given a heart!
The knight has found a heart!
The knight has found the Scroll of Magic!
The knight has found the Book of Light!
The River Styx ferry is now in service!
The knight has uncovered the truth!