Here is the full list of all 35 Age of Civilizations II achievements.
Form Australia-Hungary
Form Russian Empire
Join 50 alliances
Join 25 alliances
Form Italy
Create 50 unions
Create 25 unions
Create 10 unions
Create 5 unions
Create 50 vassals
Create 20 vassals
Adopt the Monarchy government
Capture 1500 provinces
Create 5 vassals
Form Ottoman Empire
Capture 750 provinces
Join 10 alliances
Capture 500 provinces
Capture 300 provinces
Form Japan
Join 5 alliances
Create a vassal
Form Austrian Empire
Create union
Capture 150 provinces
Adopt the ideology of Communism
Capture 75 provinces
Capture 30 provinces
Adopt the ideology of democracy
Adopt Fascism ideology
Adopt Republic ideology
Adopt the Horde ideology
Adopt the ideology of the City State
Join alliance
Capture 10 provinces