i totally have no idea if i'll actually end up watching all of these... but it's good to know the whole order, just in case.

UNIVERSAL CENTURY (UC)

• Mobile Suit Gundam
  • The 08th MS Team (OVA)
  • Gundam 0080: War in the Pocket (OVA)
  • Gundam 0083: Stardust Memory (OVA)
    • Mobile Suit Gundam I (Movie)
    • Mobile Suit Gundam II (Movie)
    • Mobile Suit Gundam III (Movie)
• Zeta Gundam
  • A New Translation -Heir to the Stars- (Movie)
  • A New Translation II -Lovers- (Movie)
  • A New Translation III -Love is the Pulse of the Stars- (Movie)
• Gundam ZZ
• Char's Counterattack (Movie)
• Gundam F91 (Movie)
• Victory Gundam

ALTERNATE UNIVERSE (AU)

• Mobile Fighter G Gundam [1994]
• After War Gundam X [1996]
• Turn A Gundam [1999]
  • Turn A Gundam I: Earth Light (Movie)
  • Turn A Gundam II: Moonlight Butterfly (Movie)
• Mobile Suit Gundam Wing
• Endless Waltz (OVA) &/or (Movie)
• Gundam SEED
  • After-Phase Between the Stars (Special)
• Gundam SEED Density
  • SD Final Plus: The Chosen Future (OVA)
  • Gundam Seed: The Movie
• ✔ Gundam 00
• ✔ Gundam 00 Second Season
  • ✔ Gundam 00: The Movie

i didn't add all of the side stories/specials