I personally have more than one way to “win” the game for each side.
Axis -
Economic Victory - The Axis powers make 150 IPC’s combined
Total Victory - The Axis powers control all Allied Capitals
Victory Objectives - The Axis powers have 5 Victory Objectives
VC Victory - The Axis powers control 12 Victory Cities or the OOB rules
Allies -
Economic Victory - The Allied powers make 200 IPC’s combined
Total Victory - OOB Rules
Victory Objectives - The Allied powers have 5 Victory Objectives
VC Victory - The Allied powers control 16 Victory Cities
World Domination is also a possibility, one we play when we have time.