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