I have been seeing a lot of post lately about people being on 90% completion or 80%, or whatever it may be. So.. I will tell everyone how to get 100% completion.

Step 1.) Go to your profile
Step 2.) Click Update Your Profile
Step 3.) Fill out everything under Login Information
Step 4.) Fill out everything under Extra Information
Step 5.) Fill out everything under Site Permissions
Step 6.) Fill out everything under Email/Site Notifications
Step 7.) Get an avatar, either by clicking View Gallery and picking one or getting one from an offsite url.
Step 8.) Click Save Avatar
Step 9.) Click Save Changes
Step 10.) Go back to your profile
Step 11.) Update Your Status
Step 12.) Congratulations, you now have 100% completion!