i have tried to reinstall my game, verified game files and reverted to the last version but all of my best runs for all the missions i did is gone so
If you're intending to reinstall your game, your saves will usually be wiped out. That's why you should go to the games directory and search for "sins2_save" files if you installed it via steam. If you did install the game via steam, then your saves will be in the steamapps directory. You can copy the saves to a different storage device and then you can preserve your saves if you are trying to reinstall your game.
Also, this game is still in development so each major update will generally mean that your game saves will be wiped out as they are no longer compatible with new updated versions of the game, so if you want to finish playing your older saves, right click the game on steam, go to Updates, and then switch Automatic Updates to "Only update this game when I launch it". Then turn your internet off or go in offline mode on steam, so the game isn't grabbing the updates and you can finish playing your saves.
