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