DYSMANTLE

This isn't a fool proof guide, but it certainly helped me. I did this at end game. At first, you may die a lot, but what I did notice, was that spawn points for each wave are the same. So get landmines, and place them down in any wave that you're having trouble with. If you do die, you won't lose any progress. So you can restock landmines. I was able to carry 9 at a time due to upgrades I had unlocked. So don't worry about this achievement. Make sure you at least have the sledgehammer fully upgraded and any trinkets you think will help. Critical hit chance and damage buffs will also help. But whatever floats your boat.