What Style of writing has Chinua Achebe used to write Things Fall Apart?

Things Fall Apart is a book that centers around a tribesman named Okonkwo, in a Nigerian village called Umuofia. Okonkwo struggles to become a great tribesman, attempting to escape his lazy father's shadow. He then struggles to deal with exile after accidentally killing a man. Later the book discusses his and the villages' struggle with the European influence.