Ok I googled my ass of on how to do this and laiuchin steam gets
Launching Xcom 2 gets
[marten@marten-pc]:[~]$ steam -applaunch 2685000
Running Steam on fedora 26 64-bit
STEAM_RUNTIME is enabled automatically
[marten@marten-pc]:[~]$ ExecCommandLine: "'/home/marten/.local/share/Steam/ubuntu12_32/steam' '-applaunch' '2685000'"
Other gamer like tome raider launch from console.The output from launching steam was too long to paste so I have to remove it. 11000 character limit or something.
Im not a linux expert.