Hi. I have a problem about getting the "undefined" achievement. When I tried to get it, the game was heavily lagged too much. Could you please fix that? (I have my strong PC btw, I played the game on it.)
That happens due to the shaking walls being enabled. If you still want that enabled, wait a couple minutes and the lag would stop.
If you don't want shaking walls, you can go to options > advanced > Enable Game Optimization
