Aleph est l'univers

So you can bring a team of four and bulldoze your way to the final boss. In the room before the final boss, change your team so that you only have one unit. If you beat the final boss, you'll still get this achievement. There are text and video guides for this achievement in the HSR Achievement Discord.

"Aleph is the Universe" is a phrase that refers to a concept originating from the writings of Argentine author Jorge Luis Borges. Aleph is the first letter of the Hebrew alphabet and in Kabbalah, the esoteric branch of Judaism, it relates to the origin of the universe, that one number that contains all others. In Borges' short story "The Aleph," the Aleph is described as a point in space that contains all other points, allowing one to see the entire universe from that single location. In this context, a single character is that point, being able to finish the entire Simulated Universe.