As the Netherlands, do not cave to the Germans, continue the Zuiderzee works, and do not lose control of any of your continental European states until 1945.
As Poland in the 1939 “Blitzkrieg” scenario start, inflict over 1,800,000 casualties to Germany to beat the 2018 PDXCON HOI4 challenge. Extra bragging rights if you do it in 30 minutes or less!
As any Allied Nation (in faction with a democratic Britain), enforce a peacedeal on Germany that disarms the Rhineland and makes it a demilitarized zone.
As Austria or Hungary led by a Habsburg Monarch, Control the Swiss Plateau and have at least three other countries be led by a member of the Habsburg family.
As Austria or Hungary, led by Otto von Habsburg, control the starting states of Austria, Hungary, Czechoslovakia, Romania, Bulgaria, Greece and Turkey as well as the states in Polish Galicia, Slovenia and Croatia.
As Germany with a female leader either annex the USA, including Alaska and Hawaii or have an American puppet that owns all the American starting states, including Alaska and Hawaii.
As Germany, get over 30% surrender progress after 1941.6.22 while being at war with Soviet Union, France and England and controlling Moscow, Paris and London.
As the Dutch East Indies (or Indonesia), research the Advanced Computing Machine and fully upgrade the Cryptology Department (while your capital is on the island of Java).