I am writing this months after having painted the miniatures. From memory, here are the paints I used.
I basecoated all minis in Chaos Black.
Reds: a solid layer of Wazdakka red, a wash of Agrax Earthshade, Wazdakka again but only covering flat, elevated surfaces and avoiding inlays - leaving them darker. Finally, I think I mixed Wazdakka Red with Wild Rider Red to brighten some elevated areas. It might have been a mix of Wazdakka Red and Scar White instead.
Bronze: a solid layer of Brass scorpion, a wash Agrax Earthshade, a thin layer of Hashut Copper over all elevated surfaces, and edge highlights in Gehenna's Gold on all edges that I expect to reflect light.
Steel: Leadbelcher followed by Nuln Oil, then Runefang Steel on elevated areas.
Rocks/bases: Eshin Grey, Nuln Oil, drybrushed Administratum Grey. Or maybe I drybrushed Ulthuan Grey, not sure. I think it's Administratum Grey.