Does anyone have a .gpx file or similar with all routes on Rainier, or a link to a Caltopo map that shows all of them? I have been able to find some maps with partial completeness but nothing with the whole shebang. Thanks.
There's like 30-40 Rainier routes in the CAG, I doubt there is GPS data out there for all of them. However, if you turn on Shared Maps in Caltopo, a lot of the common stuff is in there. You can export/copy into your own Caltopo map if you want to do additional edits or organization. (Link with some info about exporting)
In addition to the Whole Enchilada mentioned above (which does have the most popular routes), this has several more: https://caltopo.com/m/HKT6
Having climbed some of the more obscure routes on Rainier, I can say that these tracks aren't always accurate. For example, the Ptarmigan Ridge track on that link is definitely not the climbing route.