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