No, they have not! I am not sure by what metric one can compare FIFA and the United Nations, but I don't think you you are familiar with the breadth of the UN's work. Selected achievements from their results page [1]:
-Every year we mobilize about $7 billion in humanitarian aid to help people affected by emergencies.
-Every year we assist over 34 million refugees and others fleeing war, famine and persecution.
-We vaccinate 40% of the world’s children, saving 2 million lives a year.
-In 2011 the UN will provide food to around 90 million people in 73 countries.
-In the past few years, the UN has expanded legal international rights to indigenous peoples, people with disabilities, migrants and their families.
FIFA is merely better at marketing...