Creating a game for steam

Hello, I am wondering how do I go about creating a game that will include achievements for steam? I am thinking about creating a platform game for windows and possibly mac and would like to distribute it using steam. Does anyone know how to do this?

Many thanks in advance!

That would be something you’d talk about with steam. They have something called Greenlight, you post your game there and if enough people like it, your game will go on Steam. It does require a $100 to put a game on, but if you want to post another game on it, you don’t have to pay a thing, it is a 1 pay thing.