Narita Boy

Story related, can't be missed.


Once you've defeated 'The Dragon' in 'Ateneo Plaza', head left and exit the area. Now backtrack to the Main Access to the Fortress and head into the door 'Access to the Royal Stables'. Follow the path down through the Royal Stables and into the 'Estate of the Master of the Royal Stables'. Once there, open the door to the Royal Stables on the right that leads to the 'Main Access to The Labyrinth'. Once inside the Labyrinth go through the doors in this order to arrive at 'The Stable of The Servo-Horse'.

Yellow Door #6, Blue Door #3, Red Door #5 and finally White Door #2.

Interact with the Servo Horse to power it up and mount it and the achievement will unlock.

*Story related achievement, can't be missed*

For 100% walkthrough or if you get stuck use the video at the bottom of my guide Brain5454 made, all credit goes to him

This is a really long section, I am sorry in advance if I fail to describe a section or two.

You start off in the desert, keep heading right to enter yet another temple, there's a door you need to enter, make your way down to get uppercut and invisible code achievement:
Go back and you can now progress further, use uppercut and dash to get past 2 fists. There will be some doors and switches you need to press, first is stables to the right (remember where the room is), make your way down, move left a bit, and go up, there's a switch and a new door opens in the main area. You need open few doors and hit a few switched before the last door opens. Just keep heading right to progress. When you see a vertical climb section, start climbing and about half way through there's a side alley with about 5 houses, 3 of these houses have a piece of code for teleporter written in them. Take note of this code exit side alley and continue your climb. Head left to see a teleporter, enter your code and retrieve a key. You can also enter a secret code to get:

With the new code head to the side alley and one of those houses has a door you can now enter. There seems to be a mini-boss of sorts. Just hit her when she runs at you. Get the key. Just at the start of the side alley or outside there's a terminal you can use to unlock the bar. Head back into the side alley and enter the bar. There a worm, not sure how to kill it properly I used my face bean. Exit and climb all the way up to the palace where you can now talk to the king. Gives you a key for stables. Head back and you get attacked by a dragon. There's a sweeping attack you need to uppercut over, and also summons enemies for you to fight, use face beam to get rid of the big ones, once the dragon hovers close to the ground start hitting him. In the stables you can head all the way right to hit a switch that unlocks a secret door with combination in it. Use this combination to navigate through stables.