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