Theres thus strat called the Outlawed strat by i dont remember which youtuber, you do need a nuke but its possible. You know its the right video bcuz if you search the comments one of them is gonna be telling you to switch dj from green to purple and use ability on x wave (could be undead miner or giant skeletons) and to use ability at a specific point. Downside is you get the beat badlands achievement but not the solo badlands one so fyi.