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