Honestly, I don't remember. A native steam package is available in the 'multilib' repository, which should be enough to at least start Steam. To play games, I remember having to install some 32-bit Mesa packages. I also had to install libtxc_dxtn and lib32-libtxc_dxtn, which are texture compression libraries. Without these two, textures didn't appear.
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I assume you have 32-bit (multilib) support installed in order to install Steam?
Or is there some trick I'm not aware of to get native x64 Steam going under Arch?
Honestly, I don't remember. A native steam package is available in the 'multilib' repository, which should be enough to at least start Steam. To play games, I remember having to install some 32-bit Mesa packages. I also had to install libtxc_dxtn and lib32-libtxc_dxtn, which are texture compression libraries. Without these two, textures didn't appear.