The same SR3 copy to another Steam account?

[Voit-Shao]

Is it possible to install, play, get DLCs and achievements on the same bought copy of SR3 on another Steam account?

 

[Ryuuka]

i don't think it's possible. You will have to buy it again,

 

[[V] IdolNinja]

Correct. You can only tie a game to one account for any Steam game.