This achievement is weird and seems to vary for everyone, so this is what I did that unlocked it.
My Kit-
357 and ammo
primary with no ammo
no grenades, tools, etc
battering ram (not used)
no helmet
no armor
AI Team-
whatever you want is fine for them, but do not let them use grenades or tools, so to be safe remove them from their kits
Strategy
I just let the AI move and clear each area, if there was a door, simple open and clear, if it was locked, kick and clear. Make sure you shoot at least one enemy with the 357 to be safe, but let the team do the heavy lifting!