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