Without looking it up online I mean. Is there a way to find all the keys, triangles and other important stuff without having to wander this giant map pixel hunting? I have most of that stuff and I would like to get all the secrets but I generaly despise using guides to hunt down colectibles in games. Is there a way to get an in game map or in game hints of any kind?

Sorry, no in game guide, you just kinda have to make your own physical/digital/mental map of the game as you play. Essentially everything on the in game map that isn't the generic background brownish color, you can get there in some form or another.

@pyrodactyl: To be fair, all of the hidden stuff has hints but you have to pay attention to your surroundings because they are often subtle. I took my time on my first playthrough because I wanted to find everything without help as well and I did, and I never just stumbled onto anything or brute forced it. About 2 hours in I started to learn/understand the language the game uses for its visual cues, and that (along with keeping in mind that they didn't seem to make any throwaway design choices) was a critical step.