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