STORY RELATED (UNMISSABLE)Unlocked by completing all 9 campaign missions on any difficulty.
Video walkthroughs below by
360GameTV (Authentic difficulty):
Mission 1 – 'The Atlantic Wall'
Mission 2 – 'Occupied Residence'
Mission 3 – 'Spy Academy'
Mission 4 – 'War Factory'
Mission 5 – 'Festung Guernsey'
Mission 6 – 'Libération'
Mission 7 – 'Secret Weapons'
Mission 8 – 'Rubble and Ruin'
Mission 9 – 'Loose Ends'