I think this is a great question:
“If aliens visited and asked for our planet’s greatest achievement, what would you show them?”
Why?
It shows you that the largest achievements of our human species are ultimately not as great as we think.
What I would show them?
I think they would view achievement in two ways: on a spiritual and conscious level and on a technological progress level.
On a spiritual and conscious level, I’d show them Tibetan Buddhist monks, Yogis, and Shamans – and tell them about Jesus Christ.
On a technological progress level, I’d introduce them to Elon Musk and his company SpaceX and tell them about Nikola Tesla, and a few selected mathematical and physical theories we’ve formulated.