Sorry for my late reply.
The problem is not that I have cheats on. The problem is, that the last enemy Kingdom does not appear to be extinct. Thats why i dont get the Achievement, because I dont own the Golden Throne.
I guess that its a bug with the King of that Kingdom. I conquered his last castle and since then hes gone (more then 60 ingame days).
And THEN i turned cheats on to search after him at the whole map. But I found nothing. I turned cheats off and have continued to play normally.
Nothing happenend. No Message that I conquered everthing, no achievement, no golden Throne

Im very sad about it.
And now I have another problem.
After I reinstalled the game and wanted to load my save. I got a load Error.
"Load Error: Number of Scenes in file: 779, exceeds 553"
I tryed to repair the game and deleted the rlg.log
But it still dont works.
Does someone have any ideas to fix it?