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