Pretty Sure "I Am INVINCIBLE" Only Possible On 007 Classic
I played through Facility on Agent, and snuck through the entire mission (earning "Going Dark" on my way), never even being fired at, yet the cheevo didn't pop. So I decided "damage" must be in the mode where you have a health bar...enter 007 Classic difficulty. I picked the first level, Dam, and scooped up the body armor in the first tower in the mission. After that, I just played super careful, and made sure I always had body armor on. When I finished the mission I had full health and it popped.
Hans(nickname) + Jonathan("real" name) = Hansathan