If you have encountered an "impossible" trophy glitch—such as those reported on the involving invisible walls or static monitors—your only option on PC might be to download a 100% save file.
Navigate to your backup folder: Documents\WB Games\Batman Arkham Knight\ \SaveData\backup . batman arkham knight riddler trophies save file fix
Identify the most recent backup files (e.g., BAK1Save0x0 for slot 1) and copy them. If you have encountered an "impossible" trophy glitch—such
The game automatically creates hidden backup saves. If your current save is corrupted or a trophy glitched out, you can often revert to an earlier state directly within the game. save the file
Accept the warning about the file size changing, save the file, and ensure it has the .sgd extension.