How would you decide if a project is at risk before accepting it?

It makes more sense by accepting a project when it is at risk as challenges will make me more efficient in my work. Now before accepting a project, I will surely understand in deep and will plan risk response accordingly. I will evaluate all the possibilities to make the project successful. I will identify all the risks of the projects and will list them at a place. Then, I will start gathering all the resources which can reduce the risk level. At last, I will checklist all of the possible risks and gathered resources to assure that all of them will work or not.