Reference: https://i.redd.it/e8ck5pdul7x51.png
Based both on obscurity and difficulty, so if some are easy, sorry. Some are also jokes (i.e. Funk-Can, Peter Baumann's synthpop).
For further help, my kraut-album list (mostly in order):
Faust- s/t
Anima- Sturmischer Himmel
Stockhausen (lol)- Hymnen
The Can- Monster Movie
Amon Duul- Psychedelic Underground
Kluster- Klopfzeichen
Can- Tago Mago
Tangerine Dream- Zeit
Kraftwerk- 1
Guru Guru- UFO
Brainticket- Cottonwoodhill
Cluster- 1
Taj Mahal Travellers- July 15 1972
Friedrich Gulda- Gegenwart
Popol Vuh- In den Garten Pharaos
Brast Burn- Debon
Siloah- s/t
Limbus 4- Mandalas
Conrad Schnitzler- Blau
Dom- Edge of Time
Klaus Schulze- Irrilict
Ash Ra Tempel- Seven Up
Cosmic Circus Music- Sternenmaskerade
Iskra 1903/Wired/New Phonic Art- Free Improvisation
Group 1850- Paradise Now
Seeselnerg- Synthetic 1
Human Being- Live at the Zodiak
Technical Space Composer's Crew- Cannaxis 5
Wolfgang Dauner- Output
Silberbart- 4 Times Round Razing
Parson Sound- s/t
Brainstorm- Smile a While
Brave New World- Impressions on Reading Aldous Huxley
Karuna Khyal- Alomoni 1985
Floh de Cologne- Fliesbenbaby's Beat-Show
Xhol- Motherfuckers GmbH & Co.
Checkpoint Charlie- Fruhling Der Kruppel
Exmagma- s/t
Michel Waisvisz- Crackle
Eiliff- s/t
Gunter Schickert- Samtvogel
German Oak- s/t
Cornucopia- Full Horn
Association P.C.- Sun Rotation
Einsturzende Neubauten- Kollaps
Kollektiv- s/t
Hero- s/t
Neu- s/t
Annexus Quam- Osmose
Moolah- Woe ye demons, posessed
Selten Gehorte Musik- 3. Berliner Dichterworkshop
Der Plan- Geri Reig
Amon Duul II- Yeti
Organisation- Tone Float
Novaks Kapelle- s/t
Thrice Mice- s/t
Nine Days Wonder- s/t
Agitation Free- Malesch
Tomorrow's Gift- Goodbye Future
Necronomicon- Tips zum Selbstmord
Dennis- Hyperthalmus
Zweistein- Trip Flip Meditation
Anton Bruhin- Von Goldabfischer
Between- and the Waters Opened
Lily- V.C.U.
Nosferatu- s/t
Out of Focus- s/t
Sergius Golowin- Lord Krishna von Goloka
Gila- Free Electric Sound
Yatha Sidhra- A Meditation Mass