This command clears all achievements and user statistics.
The debug_achievements_clear command in Stellaris is used to clear or reset all the player's achievements and user statistics.
This effectively means it will erase any progress made towards the game's achievements and all user stats, essentially setting them back to zero or as though you've never played the game.
In Stellaris, cheats are executed from the command console, a text box that you type commands into.
To open the command console press the ~(tilde) key, which is typically located under ESC (escape).
If your keyboard does not have that key, or pressing ~ does not work, try the following keys:
Type your command into the console, and then press ENTER .