I think main passes are :
Diffuse Color
Direct Lighting
Indirect Lighting (GI)
Reflection
Refraction
RAW of above channels
Specular
WireColor
RenderID
SelfIllumination
ZDepth
Ambient Occlusion
SSS
Normals
Velocity
Anyway the more elements you have (except main ones) the better it is, as it will make our life easier when it will come to composing :)
And some channels to see how Corona handles GI and samples. In VRay it is samplerate channel.