Hi!
I've made a video guide a few weeks ago, showing how to get Guild Wars 2 running on Steam Deck.
Since the Steam version made the whole process really easy, I've now made an updated version of that guide. It works for both Steam- and non-Steam accounts, but you no longer have to do anything in desktop mode.
I've also added a large section explaining my controller layout, as I've had many questions about that.
I hope you'll find this new version helpful!