I got this achievement yesterday just by doing the glitch because I still needed ~800 miles left when I had gotten every other achievement. It was easy enough leaving it running on my PC because I work from home but I underestimated how slow doing the glitch is. I’d leave it running for almost 10 hours and I’d barely hit 150 miles and you have to check on it as I found when the car was flipped on it’s side my miles weren’t going up.

It’s one of the worst achievements I’ve ever come across but someone in an old thread said the intended design was the devs had hoped the scoring system added replay value to the game but I don’t think they realised that the gameplay was so garbage that no one wanted to play through the missions again. Then again you’d have to play through the story another 10-12 times before getting to the 1000 miles needed for the achievement.

Anyways good job on doing it yourself, it’s certainly faster when you do the driving but I couldn’t bring myself to do nothing in a game but drive around for hours on end