For Heer awards you can get a modern day reprint of
MERKBLATT 15/5 ORDEN UND EHRENZEICHEN which gives the criteria for the awards (no images though).
A copy can be found here but you will need to register to order it:
https://www.history-shop.de/katalog/...EN_126668.html
For Luftwaffe Flight Clasps there is
Flight Clasps of the Luftwaffe by Stephen Thomas Previtera (ISBN: 978-0967307053) although it does tend to be expensive as are many of these niche books.
For the Pilots Badge there is
Luftwaffe Pilot and Combined Pilots and Observer Badges guidebook by Sébastien Talbot and Stephan Papke.
https://www.generalassaultmilitaria....stephan-papke/