Do you think it is possible to do every ending blindly?

I really like playing without knowing anything and likes figuring things out but my friend that played this game a lot and for years is not sure that I can do every ending alone.
He played this game with the wiki open and he told me that beating everything in the game is like beating Minecraft without checking how to beat it…
Idk if he is right tho because the notes that I found are pretty helpful and I already figured a lot of things on my own.
Do you think I can make it without any out side help?