The campaign is divided into different sections.
You dont need to complete the subsections to unlock the next section however the game tells you it wll be a bit more difficult further on if you fail to meet the objectives for a section.
A section can have 3- different goals you need to archive in a specific time. Let say one of them is to sink 100.000 grt in an area before then 1 juli 1940. If you manage to do that you get accomplish points (small stars) and your ultimate goal is to get as many stars as possible for the german side to to get an advantage.
When all timeframes are reached , no matter if you failed or succesful the germans goal, you will be moving on to next section.
Each mission you take can have a micro sub goal also. Like spy insertion. Photo reccon etc. like it was in sh4.
Only problem i have whit this sections goal is that its hard to find some specific targets. Like to sink an carrier. And do that before the time frame comes to an end or els you will fail that mission. But like i said, the war will move on no matter how succesful you are but to what cost i dont know, eg if the game gets harder if you fail.
__________________
 
|