I think it would be hard to somewhat regularly buy books or go to a (typical English language) bookstore without seeing anything about Margaret Atwood.
But maybe there is a large world of English speaking people who don’t at all follow book releases or tv or even headlines in the mainstream news (where her winning of awards would be announced).
Margaret Atwood has written much more than those two books - she is a prolific author. According to Wikipedia she's she has published 17 books of poetry, 16 novels, 10 books of non-fiction, eight collections of short fiction, eight children's books, and one graphic novel, as well as a number of small press editions in poetry and fiction. Her works are popular, both with the general public and with critics.