This is from like 2011, if you enter the server you have just no password for, or it just doesn't connect you, you can go to login page and enter any name and password you want, it will "login" you. But you can't do anything to the account, since password was wrong and it didn't authorize you, but I guess you can have all the steam achievements of the account you are "logged in to".

i mean all the achievements account can get you but actually same thing