Here is my 100% Achievement Guide!
When you head outside for the first time, you do a few things an then head left a couple of times.
You eventually stumble across a man dressed as a huge tree.
Click on him and a light puzzle game ensues.
You have to press the d-pad to complete the section.
In the top right hand corner you see the diagram on how it needs to be filled.
So first off, press right to fill the 3 lights, next one, you need to fill more lights.
It is easy enough, and there are only 6 levels...
The final 3 levels have a white bulb in them.. This means you have to go over them twice and there are only specific routes to do that.
Go to 19:30 in the video to see where and how it is done.
Hope this helps!