I highly think this is a bug, since Im not the only one who's had this problem as refered to these two people: and, which indicates that this is a rare, but still re-occuring problem. I then started a completly fresh campaign from the beginning on hard difficulty to maximise score gain, and played it in one sitting until i finished both 'South China Sea' and 'Singapore' (as seen in picture 2), but still, no assignments got unlocked for completing them. I then proceded with deciding to do a complete wipe of the game by uninstalling it, and deleting the documents-folder for it so the campaing progress would get reset completly. I replayed the mission over and over again on different difficulties, with and without dying and always ended up over the required score for gold, but still didn't get it. I thenproceded with just starting the campaing from the start and replayed it to see if that would help, it didn't. I the replayed those two missions in case I just issed them and didn't get the required score at the time, but noticed after completing it that I didn't unlock the assisnment.

I was trying to re-play the campaign for Battlefield 4 on steam after a while of not playing, with the goal to get the full arsenal achievment, but noticed that I was missing two assignments for singleplayer, which was get gold score for the missions 'South China Sea' and 'Singapore'.

Battlefield 4 campaign unlocks