You can configure Unity using XML configuration. In your case it would look something like this:
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
</configSections>
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<container>
<register type="MyApp.AccountController, MyApp">
<constructor />
</register>
</container>
</unity>
And then you need to explicitly load the configuration:
IUnityContainer container = new UnityContainer();
container.LoadConfiguration();