With Windows 8 you can use local user or Microsoft Account for computer login.
For both you can set autologon:
Press Windows Key + C. Then click on Search.
Click on the username in the Users window, which should be your email address if you are using the Microsoft account to log into your Windows 8 PC.
Now you need to uncheck the “Users must enter a username and password to use this computer” box. After you do that, click OK and you’ll get a pop up dialog that asks you to enter your login credentials.
For some reason, it uses some different username that is not the same as your email address, so don’t change it. It must be some internal representation of your email address that Windows 8 actually uses to log into Windows. Just type your password twice and click OK.
Now restart your computer and Windows 8 should automatically boot up to the Start Screen, bypassing the login screen.