Battlefield: Bad Company
50 Achievements
1,000
150-200h
Never Used a Door
Destroyed 1000 walls
15
How to unlock the Never Used a Door achievement in Battlefield: Bad Company - Definitive Guide
http://badcompany.ea.com/
go to My Soldier and then the multiplayer achievements screen and it will show you everything you want to know. extremely useful imo.
Aim for houses, buildings & fences. Don't be shy! Tanks work well too. If you are driving a tank, be sure to drive over fences, as these count as walls too.
The fastest and best thing in the game to destroy things is a Light tank. This vehicle in located in End of the line(gold rush only), OASIS, Valley run, Deconstruction, Harvest day, Over and out (after 2nd checkpoint), and Final Ignition. I would recommend trying to do it late and night on Conquest while there is barely anyone on. If you want to get a few walls while you cannot get in a light tank, choose a tank, or be Assault class and use your Grenade launcher (RB), AA guns are great but they are limited.
Unobtainable, Server now Closed
This will come naturally along the way to 10,002 kills. If you can't wait though, then just hop in a tank and destroy as many buildings as possible and it will unlock after several matches. 'End of the Line' is a good map to do this on.
Walls are considered to be either fences or walls on a building. See the achievement “Home Wrecker” for tips on destroying a wall.
The best place I found to destroy walls was on the level “Deconstruction.” There are quite a few fences around that you can quickly knife down on defense as well as thin sheet metal walls that you can destroy with a grenade launcher.
There are enough buildings that you shouldn’t run out of wall to destroy. I recommend sticking to the support class and using your power tool to decimate anything in your path, the assault class also works well with its grenade launcher for getting far away obstacles. If you’re attacking there are a few good vehicles you can take to destroy the buildings.
Remember to check your soldier on the Bad Company site (see the achievement “Leatherneck”) to see your progress.