movingcastle: I have finished the game and both DLCs 100%. However, due to some weird glitch I haven't earned most of the achievements in Foundation DLC. The only way to get the is to play again the DLC. I don't care about keeping the abilities and costumes I have earned after finishing the main story.

I have tried using chapter select, selecting the last chapter, replaying it and then heading to the place where Foundation DLC starts. However, the areas were not reset correctly there. All documents were already found, there was a hole in the ground near the Nail, etc.

Has anyone found a way to do replay the Foundation DLC with its areas reset correctly? The most obvious is to have a clean install of the game, wipe all saves and all local files including gameplay.db, and then play the base game and the Foundation afterwards... But that will probably not earn me the "Director of the FBC", most likely I will be permanently locked away from that.

B1tF1ghter: Why did you not back up the saves before starting the DLC anyway?

movingcastle: Well, I have those backups, and they don't work as expected, the game state is only partially restored (e.g. areas locked, but documents are already in the journal). Actually, doesn't really matter now. I have moved on. But thanks for replying.