Doorbuster - Destroy 100 Force Field Doors, Magical Barriers or Reinforced doors
I wanted to get this out of the way and not wait for the right maps to present themselves. I was able to use the Tip / Alignment mission called "An Unstable Trigger" to get this done quick. The mission takes place in the council/5th column map that has the prison w/ 15 doors. You can run to the doors, then exit and reset.
There is a supergroup base object called the Mission Computer that allows you to create this mission for 1 reward merit. I believe you need to be level 40, and if you don't have an SG base, you can use one of the public bases. I'm on Torchbearer and the public base had the mission computer.
Now, people kept telling me that I could do this badge in safeguard/mayhem missions, but other than the vault door, which is a totally different badge, I didn't see any doors I could break down.
Hopefully this will be helpful to someone. Happy badging!