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