What did Charles Darwin not accomplished?

Charles Darwin did not discover the concept of evolution; rather, he formulated the theory of natural selection as a mechanism for how evolution occurs. Additionally, he did not fully understand the genetic basis of heredity, as the principles of genetics were not established until after his time, with Gregor Mendel's work in the mid-19th century. Furthermore, Darwin did not address the implications of his theories in terms of human evolution until later in his career.