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You need to first configure your Steam Community profile Custom URL at https://steamcommunity.com/. You must also set your Profile Status to Public. There is a Steam Community KB article with more information.
Make a note of your Custom URL suffix:
Note: If you change your Steam Community Custom URL, you'll need to also update it in the Steam Achievements application.
On the Settings page, complete your Custom URL and hit Save.
To have your achievements published automatically, check the Auto Update box and hit Save. This will publish any new achievements you have earned a few times a day.
Publish your achievements on the Publish page. Select up to five achievements and click Publish Selected. The post on your wall will look like this:
Note that only achievements earned within the past two weeks will be displayed on the publish page. You may also see older achievements from games that you've played recently if the unlocked date wasn't recorded. See the auto update page for more information.
Click the View Achievements link under any game in the Games box to view your achievements.
All Steam games that have Steam achievements are supported. For a full list, please visit http://steamcommunity.com/stats/. Please note that this list does not include Games for Windows Live titles purchased from Steam as these games use the Xbox Live network.
Some free games, such as Alien Swarm, will show up in your list even if you have never played them. Feel free to ignore them.
Not all achievements are made available to the Steam Community XML API, the API used by Facebook Steam Achievements. It seems that these are maintained separately from the game itself. The games below are known to have missing achievements. We'll update this list if we learn of any others.
- Alien Swarm
- Half-Life: Episode 1
- Half-Life: Episode 2
- Team Fortress 2
- Dawn of War II - Retribution
Unfortunately, there's not much we can do about missing achievements. You can help by posting on the Steam forums.
Please see the auto update page for more information how it works.
If you have a long list of unpublished achievements, you may have to scroll down the page so see the publish dialog.
Why do I keep getting the message "Your achievements could not be updated. If this problem continues, please verify that your Custom URL is correct and that your Steam Community Profile is public." when my settings are correct?
Please verify your settings and try again. If you only see this occasionally, its likely because you are trying to update your achievements when the Steam Community is unavailable.
Login at https://fbsteamachievements.azurewebsites.net/ and remove your Steam Community Custom URL from the Settings page.
If you have an idea on how to improve Steam Achievements for Facebook, please add it to the issue log.
If you have a question that is not answered here, you can create an issue in the issue log.