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