Note: This guide is no longer valid as the game launcher has been removed by the developer.

Go to the right side and select the gear icon on the steam game page





Now select the Properties from the drop-down list



In the general section, scroll down a bit, there you can find a box under the heading Launch Options where you can type



Please type the command given below in the box

"BioShockInfinite" -run %command%



and Voila your game will now directly launch without opening the 2K launcher.