The Bigger Picture, with the description of: 'Completed each mission of the Apex Protocol campaign chronologically', completed when I played through each mission of the campaign one after the other - 1, 2, 3, 4, 5, 6, 7.

This wouldn't be an issue, except 'chronologically', mission 1 is actually set after mission 4, of which missions 2-4 are set as 'flashback' missions.

Either the achievement is working incorrectly, or the description should be modified.