Here is the full list of all 18 Stellona achievements.
Make a new enemy.
You hear about video games?
Complete the museum's collection.
Attend a murder mystery party.
Save a relationship, kind of.
Complete Bonnie's obstacle course.
Joined a gang.
Destroyed something beautiful.
Don't touch that!
Tell a campfire story.
You're a persistent one, aren't you?
Make a new friend.
Attend a tea party.
Do you have something to share with the class?
THE ONLY SOLUTION
Paint a portrait.
Hatch some eggs.
Complete the main quest.