When you start a mission, choose custom avatar and select traits on the last page. You will need to upgrade all these traits to the maximum. Finishing one campaign mission will level up all selected traits by one level. You need to complete 51 missions or sandbox games to get this. The easiest way is to just go for god mode sandbox games with a duration of 10 years. You don't actually have to do anything during these 10 years, so just confirm any messages you get and keep repeating, till you have one star left to do (or one star per trait), then start a sandbox game without god mode and play through it normally. God Mode locks any kind of achievement, it will also prevent you from getting this one, so disable it for your final round.