Which aspects of Egyptian culture were key in helping them attain these achievements?

(The question is referring to how Egypt could built the pyramids)

Mathematics.

Architecture.

Explanation:

The Pyramid and the Sphinx was predicted to built around  2550 to 2490 B.C. This was a really impressive accomplishment considering how limited the scientific knowledge that most countries in the world had at the time.

These structures proved that at that time, The Egyptians might have a more advanced knowledge in Mathematics and architecture compared to the rest of the world.

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).