To answer your first question: When you completed a mission you hear a voice saying "Mission accomplished. Continue with your mission" or "Mission accomplished. Report for debrief."
Concerning the 1. mission: I think you just have to mark every surface contact. Perhaps you have to detect some submarines as well. However you do not need to classify them, so you just have to detect all sonar contacts and DW will tell you when you detected all subs in the area.
If you want to we can discuss this in German via PM.
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