Image: Rebel Wolves / Bandai NamcoOfficial screenshot from Rebel Wolves / Bandai Namco.
Realmwalker is a hidden achievement for your first trip into a hidden realm. You cannot miss it, since the story takes you there by the end at the latest.
Enter the realm for the first time. Guides say this happens during the final boss fight at the latest, so finishing the story is enough.
Visit Anachora for the first time.
Image: Rebel Wolves / Bandai NamcoAntique Aficionado
Discover the Ancient Ruins.
Image: Rebel Wolves / Bandai NamcoBig-City Living
Visit the city of Svartrau.
Image: Rebel Wolves / Bandai NamcoBird's-Eye View
Climb every tower and scout the land around it.
Image: Rebel Wolves / Bandai NamcoCapture the Flag
Tear down all of Brencis's flags.