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