The Trans-European Alpine Route (TEAR) is an unofficial hiking route put together by Dylan Ivens, which he hiked in 2019. The main idea behind this route is to cross the entirety of Europe, whilst trying to remain in the mountains where feasible. Dylan has an great website that does an excellent job of describing and showcasing the route. If you are interested in reading more, I highly recommend you take a look there.
This map shows the route I actually hiked in 2022 including side trips.
I uploaded extra photos from my hike to this Google Photos album.