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

After defeating Mordegon in Act 3, Head to the throne room. Leave the throne room and go up the stairs on the right or left and out onto the balcony. There will be some cutscenes. Go to the Emerald Coast on foot. There will be a cutscene and you'll get on the flying whale. Go the floating island in the northeast. Go up the stairs, around the circle to the north, and stand on the platform. Here, go west up the path. Open the three chests behind you to get an ultimate key, and two outfits. Go to the temple in the center. Talk to the watcher inside. All your companions will level up to where they were at the end of act two.

Now play the Calamus flute. Head over to the Warrior's rest inn, and look for a landing spot.

Continue along this path until you come to a seedling. Interact with it. Play the flute again and this time, go towards Gondolia and look for a place to land. Go along the path and touch the seedling again. Zoom to Angri-La. The last seedling is to the left, before the first set of steps. In the white space, walk forward and touch the tree. Touch the tree again. Talk to the wizard. Head into Angri-La and talk to the purple dot in front of the inn. Zoom back to Havens Above. Return to the mural in the Northwest. Play the Calamus Flute and go back to the tower north of Yggdrasil. Make your way up the tower. Talk to the tall tockle. This will unlock the achievement.