Untitled

Sharepoint client object linq for FieldCollection
ClientContext.Load(
    list,
    inc => inc.Fields.Include(
        field => field.Title,
        field => field.InternalName,
        field => field.ReadOnlyField,
        field => field.Required,
        field => field.FieldTypeKind
    ),
    inc => inc.Fields.Where(field => FieldType.Lookup == field.FieldTypeKind).Include(
        field => (field as FieldLookup).LookupField,
        field => (field as FieldLookup).LookupList
    )
);