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