Gah. I got done with Chapter 1 and decided to go back and S-rank all the missions and do all the side objectives. I've got ONE left, fucking Lingua Franca. Shit is so bugged. Can't get the "extract containers" one and I can't seem to get the "listen to all interrogations" one. They just don't trigger.
It's not bugged, it's just not as clear as it should be, there are 4 containers in Lingua Franca and the way to ensure you complete the objective is to
grab all 4 in one go, I had the same problem until I waited for all 4 to re-appear and then triggered it.
As for listening to all Interrogations objectives, when the mission starts, a prisoner is immediately driven up to where the translator starts out and they talk to him briefly, you have to leave them be and let them walk that prisoner to the woman in Kiziba Camp or whatever, they'll interrogate them together before they finally go back for the viscount. The interrogations one took a couple of attempts because I would always wait for the translator to wander off to interrogate the first guy and then I would snag that prisoner walking away with a guard, so eventually I found out I was stupid and should have been paying attention, I would have learned sooner that they were taking that guy over to the female for a double interrogation later in the mission, which is what you need to listen to.
It's easy to forget about, but listening to and watching/following guards in and out of missions gives you a pretty significant amount of context for whatever is happening, some free roam scenes with guards talking have been really good throughout my game.