How do I see all my failed login attempts (macOS High Sierra)
You can retrieve the failed login with a command like the following:

For streaming data:

log stream --predicate '(eventMessage CONTAINS "Authentication failed")' --style syslog

Or, failed logins in last hour:

log show --predicate '(eventMessage CONTAINS "Authentication failed")' --style syslog --last 1h

But, this won't show the username for the failed request, only that a failure occurred.