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