How to Manage Steam Achievements Manually
The Steam Achievement Manager lets you manually unlock and lock achievements for any game in your library, as well as modify game statistics. Unlike the Achievement Unlocker, this is a one-by-one manual tool — useful for targeting specific achievements without automation.
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Achievements
Click Your Games in the sidebar
Click beneath the game image to open the achievement manager
On the achievement manager screen you will see a list of achievements for that game, if any are available
Click Unlock or next to an achievement to unlock or lock that specific achievement
Click Unlock All or in the page header to unlock or lock all achievements for that game at once
Statistics
Click Your Games in the sidebar
Click beneath the game image to open the achievement manager
On the achievement manager screen, click the Statistics tab. You will see a list of statistics for that game, if any are available
Change the value of any statistics you want to modify and click Save Changes