What was an achievement of the aztecs?

One of the achievements of the Aztecs was the construction of Tenochtitlan, their capital city, which was one of the largest and most advanced cities in Mesoamerica at the time. They also developed a sophisticated system of agriculture, engineering, and architecture, including the building of temples, pyramids, and intricate water management systems. The Aztecs were also known for their intricate artwork, especially their intricate stone carvings and colorful murals. Additionally, they developed a complex social and political system, as well as a highly organized military that allowed them to expand their empire and control a vast territory in Central Mexico.