UBOOT achievements

Sink a total of 3 aircraft carriers travelling in convoys.

Complete the mission of retrieving the Enigma from a sunken U-boat.

Complete any campaign.

Complete all stages of the campaign objective Operation Drumbeat.

Complete all stages of the campaign objective Southern Routes.

Complete all stages of the campaign objective Tonnage War.

Earn the German Cross in Gold with any officer.

Complete all stages of the campaign objective Arctic Convoys.

Survive a battle during which enemy ships dropped over 100 depth charges on your U-boat.

Sink a cargo ship requested for sinking by command, which is sailing in a convoy of at least 15 ships, without sinking any other ship in the convoy beforehand.

Earn the Iron Cross 1st Class with any officer.

Earn the Knight's Cross with Oak Leaves and Crossed Swords with any officer.