You could count things like * number of launches using own-nation capability * number of people launched * number of moons/planets/asteroids/comets orbited

You could count things like * number of launches using own-nation capability * number of people launched * number of moons/planets/asteroids/comets orbited * number of moons/planets/asteroids/comets landed on For some answers, you might want to check https://en.wikipedia.org/wiki/Spaceflight#Spacefaring_civilization:_nations_and_other_entities https://en.wikipedia.org/wiki/Spaceflight#Spacefaring_civili... and https://en.wikipedia.org/wiki/Human_spaceflight#Milestones and others