The original one. Research done by myself & the users cited below.

Letterboxd sources & useful lists:

•Climbing [Jake J]
•climbing [kaiasiegell]
•Climbing [Oliver]
•Climbing 🧗🏻 [WTSherman5276]
•Complete Reel Rock Collections [Moksh Chitkara]
•Dağcılık Filmleri (Films About Climbing and Alpinism) [Gökhan Arslan]
•Hiking and mountaineering films according to Wikipedia [Carlin]
•Mountains/Mountaineering/Climbing Movie List [Stig]
•Mount Everest Cinema [ricardo]
•Reel Rock [Basile Paradis]
•Reel Rock Shorts [gbushong]
•Reel Rock 5-10 [EmptyForm]
•70. Trento Film Festival (2022) [Luigi Pepe]

Can’t find / not on LB:
•"Fitzroy" (1978 dir. Dee McLachlan)
•”Solo Ascent” (1986, dir. Dee McLachlan)
•Tape of Johnny Dawes climbing “Quarryman”. There's a rip on Youtube without the original audio.
•Vertical Limit Guide to Climbing (2009)
•"Everest the Promise" (2011)
•Cliffhanger Guide to Climbing Gear (2012)
•”Now That’s What I Call a First Ascent”, UK series (it's awesome. Segments are available on Youtube.)
•Vice documentary about Russian urban climbers- people who climb on antennae & rooftops. one guy was attempting to scale a bunch of enormous Soviet-era sculptures in Moscow. Super interesting, but I can't remember the title!
•”Game of Thrones", TV series: unrealistic climbing scenes
“The Horn” (2016): series following a Swiss helicopter rescue team.

My list directory:
trans*-themed lists
Research | Transmasc | transfem | Nonbinary | Intersex
I kept hitting the character limit on the transfem list, so I made these other ones, in order to keep the descriptions shorter.
Adult | Crime | Military | Music | Politics | Sports
Other queer-themed (less trans*-focused) lists:
Ecoqueer | Neuroqueer | Nautical Queers
Misc:
Adaptive Sports | Agoraphobia | early color | Eric Perlman's "Masters of Stone" | Institutionalized | Movies where they form a band