Conversation so far:
Did Gwen Stefani win any awards?
Gwen Stefani has won three Grammy Awards. As a solo artist, she has received an American Music Award, Brit Award, World Music Award, and two Billboard Music Awards.
When did Gwen Stefani win her first award?
Gwen Stefani's first award was the California Music Award for Outstanding Female Vocalist in 1998
What are some of the awards that Gwen Stefani won?
Throughout her solo artist career, Gwen Stefani won music awards, including: one Grammy Award, four MTV Video Music Awards, one American Music Award, one Brit Award, two Billboard Music Awards.
Did Gwen Stefani win any other awards aside from her solo artist career?
With No Doubt, Gwen Stefani has won two Grammy Awards.

Question: What was her biggest achievement?
Self-contained rewrite: What was Gwen Stefani's biggest achievement?