Trezor is not FIDO certified simply because we have not attempted to do so. We believe that open-source and transparency is better to follow rather then relying on third party authorities. Learn more if you like about our Security:Security philosophy - Trezor Wiki
Anyway, currently there is no plan to apply for FIDO certification. However, you can still use Two-Factor Authentication with Trezor U2F - Trezor Wiki