Narita Boy

This is in the blue chapter, once inside the baths (sensen i think it's called) you will need to press 2 buttons to get a key. go back and downstairs to where the baths reception is, to the right there's a terminal where you can use this key and another terminal to make a drummer play. Insert key, make him play and enter the door. You can now climb the mountain and get your achievement

For 100% walkthrough or if you get stuck use the video Brain5454 made, all credit goes to him:

Story related, can't be missed.


After checking up on the Lighthouse keeper and reporting back to his brother, he will provide you with access to the Grotto. Inside, you'll learn the Downstab move and have fight The Crab just below in the 'Underground Cave'. After defeating him you'll enter 'The Grotto of the Ancient Ones' and receive the first key to enter the thermal baths. Make your way to the Thermal Baths building and insert the key into the terminal on the right. This will make a portal appear that will send you to the 'Cave of the Strange Collision'. Break the floor with your Downstab move and head into 'The Guru's Hideaway' and speak with the Guru to receive the second key to the Thermal Baths. Exit through the transcriber portal to your right by using the code lit up in the stone beside it.

After entering the thermals baths you'll enter the 3rd door on the second floor, defeat the enemies and push the button to open the 1st door on the floor. Enter the 1st door, defeat the enemies and collect the key. Head to the first floor and interact with the terminal on the left (this lights up the path to the summit) and interact with the second terminal to open the door. Climb the wall to earn the achievement. Interact with the summit to be teleported 'Nakunak's Dwelling', speak with her to receive the key to the boss room in the bathhouse. After defeating the boss, you'll view another memory and that will be the end of the blue house. Next up, red house!