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