Achievement Manager
The Achievement Manager feature allows you to manually unlock and lock a game’s achievements, as well as modify an achievement’s statistics.
You can use the search bar at the top of the achievement manager screen to search for an achievement by its title
Steps
Achievements
Click in the sidebar
Hover over the game you wish to view the achievements for, and click to view the achievement manager screen
On the achievement manager screen you will see a list of achievements if any are available for that game
Click Unlock or Lock next to an achievement to unlock or lock that specific achievement
Click Unlock All or Lock All at the top of the achievements list to unlock or lock all achievements for that game
Statistics
Click in the sidebar
Hover over the game you wish to view the statistics for, and click to view to the achievement manager screen
On the achievement manager screen click the statistics tab
Change the value of any statistics you want to modify and click Save Changes