It’s pretty easy to install steam now than a year ago.

On top of the standard steam package, we will need some additional packages for Arch. In my case, I have both ATI and Intel video card installed in my laptop. Hence the need of lib32 of ATI and Intel drivers.

$ sudo pacman -S steam
$ sudo pacman -S lib32-ati-dri lib32-intel-dri lib32-flashplugin

For more details on steam package in Arch, check out the always useful ArchWiki.

Happy Steam gaming!