Forum:Atlas Mech. Question.

On the Atlas Mech page it says:

"The Atlas' cockpit window can be shattered after its shields have been taken down. This requires a considerable amount of sustained fire, but breaking the window will leave the pilot vulnerable to attack. Killing the pilot will destroy the Atlas immediately in multiplayer. In some instances in single-player, however, this will leave the Atlas intact and able to be piloted by the player."

Obviously this is true as there is an achievement for it. My question is what is the best tactic to do this? Only once have I managed to break the window (single player demo) and by then the atlas was about done for and exploded very soon after. Does difficulty setting help? Has anyone managed it?