Brütal Legend

I had a very hard time getting this one because Ophelia kept destroying my Crusher after a few minutes, finally I figured I needed decoys.. but not just any units which could kill steal my kills. Thunderhogs make good units to keep the enemy distracted while you mow them down, also, dont linger in their stage all the time because the Avatar will respawn and hit you, then youll kill her, she'll respawn and hit you again and you can repair your crusher so you will eventually lose.

Do hit and run tactics and attack when you see one or two squads waiting for deployment.

If you're trying to do this legit, the best thing to do is send in some beefed up Headbangers from one direction, then flank in the other direction with the rock crusher. The best team to do this against is Drowning Doom. The aim is to take out enemies with the front of the crusher. Reversing over them or using the special ability will not count. So it's best to always go forward and only perform u-turns when out of enemies way. Use the special ability if you're feeling a bit overwhelmed and there are too many enemies coming at you to clear some space.

The best way to get this achievement is with a spoof account or a friend. Have them play Drowning Doom, while you are Ironheade. The map doesn't matter too much, but Pleasure Dome is a good one, because it has a lot of spacious areas.

Have your friend spawn in a few Grave Diggers. The achievement is for 25 kills, so 5-6 units should do the trick. For ease, it might be better to do a two at a time.

As they spawn in, simply run over them. It can be tricky, since they will attack on site and it only counts if you get the kill while running them over with the front of the crusher. Reversing over them doesn't count. Simple run them over, keep going and do a quick U turn and go again. It takes a couple hits to finish them off. Have your friend spawn in more where necessary. Just rinse and repeat until it pops.