As other comments have pointed out, devices (mobile and desktop app) do require
2FA and there's no way around that. So I'm assuming you meant the keybase.io
website where you can log in with username and password.
Note that the functionality of the website is very limited. You can't access
any chat messages or non-public KBFS data, for example. The most power thing
you can do is resetting your account, and after that is probably using your PGP
key if you uploaded an encrypted version of your private key to Keybase. If
this worries you, you should turn on lockdown mode [0] to require a device to
access those features.
Note that the functionality of the website is very limited. You can't access any chat messages or non-public KBFS data, for example. The most power thing you can do is resetting your account, and after that is probably using your PGP key if you uploaded an encrypted version of your private key to Keybase. If this worries you, you should turn on lockdown mode [0] to require a device to access those features.
[0] https://keybase.io/docs/lockdown/index