This game has a huge amount of unlockable content, so it is reasonable that many players would not like to have to seat through the whole process of unlocking everything. If you wish to unlock everything from the start, you need to perform a save file hack:

• right click on Schwarzerblitz in your Steam library, then select Properties, then Browse Local FIles
  
• open the config folder, then open the file named "saveData.ini". This file will be there if you started the game at least once
  
• paste the word iwantitalliwantitalliwantitnow right above the line #STORY_EPISODES_CLEAR, as shown in the picture below
  
• save the file and start the game. Everything will be unlocked.