DRAGON QUEST XI S: Echoes of an Elusive Age - Definitive Edition

After earning
Follow the cobblestone path to your home. There'll be a cutscene. After the cutscene, it'll be night, go to the center of town and talk to Gemma. (Look for the pink dot on the map). After you wake up, you might want to go across the river to the shop. Head to the north, and out of town.

Equip Gemma's Charm for +1 defense. Go North across the bridge and into the cave. You'll probably want to avoid most enemies. There will be a cutscene when you reach the bonfire on the map. Rest here, then cross the river. Through a small cave and across a bridge, you'll find Heliodor.

Head straight through Heliodor and up to the castle. Up the steps and in to speak to the king. A Cutscene will play and the achievement will unlock.