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

After
Exit the room, and talk to the nun. Leave the chapel and a cutscene will play. Agree to join up with Erik, then go back to Heliodor, in the NorthEast. You'll probably need to fight some monsters. If you get too injured, you can return to the bed in the church. Along the path, look for a tree with blue sparks. Press at it to collect some buzzberries. Go on up and into the cave to return to Heliodor.

Stop at the item store on the right, and buy a holy water. Go forward to the pile of junk. A cutscene will play and Erik will point you to an inn. Go into the inn and another cutscene and Erik will direct you to a tower. Go up the tower, watch a cutscene and head back to the inn. Talk to the redhead.

Now you need to acquire a dog. You'll need the buzzberries and the holy water. Go talk to the kid with a pink dot over their head. Walk over to the guard. Past where he was, you'll be back in the good part of town. Head North to the stairs, then take a right and go to the pink dot on the map. It'll be a house with a garden. Using to jump and the ladder, head up to the roof of this house. Then walk across the rope to the church's roof, and the rope from the church to the upper part of town. Derk's shop is in the Southeast.

Follow Derk back out the shop. Head back down into the lower part of town and back out into the wildness where you came from. Here you want to head south into the manglegrove. Continue south to the campsite. Play with the forge, then go East. Interact with the plant here. Now go North and West to the pink dot on the map.

This is a hard fight. Tricky devil can cast spells that deal 12 damage to your entire party. Have your hero cast heal when anyone gets injured. A cutscene will play and the achievement will unlock at the end.