Here is the full list of all 26 Crystal Ortha achievements.
Completed 5 story quests.
Completed 10 story quests.
Completed 15 story quests.
Completed 20 story quests.
Completed 25 story quests.
Completed all story quests.
Cleared the sub event 'Mouse Extermination'.
Cleared the sub event 'Bandits in the Dunes'.
Cleared the sub event 'A Present Showdown'.
Cleared the sub event 'The Sandstorm Causer'.
Cleared the sub event 'A Forest Ruffian'.
Cleared the sub event 'A Missing Daughter'.
Cleared the sub event 'A Forest Hideaway'.
Cleared the sub event 'On the Blizzard'.
Ross has learned 5 skills.
Ross has learned 10 skills.
Ross has learned 15 skills.
Ross has learned 20 skills.
Obtained 5 skills by Learning.
Obtained 10 skills by Learning.
Obtained 15 skills by Learning.
Obtained 20 skills by Learning.
Obtained 30 skills by Learning.
Defeated 100 enemies.
Defeated 500 enemies.
Defeated 1,000 enemies.