Overview
I was in doubt on how and where I could get this Achivement and I couldn’t find a thing talking especificly about it. So, I make this to help you, who are in the same situation.
At the End of S3L4
Right after getting Indiana Achievement, you will find this:
Following the map on the left, you will go up:
Just like that. Going as high as possible you will get this Achievement.
I hope, it was helpful, mates.
T.K