Script to print all asset bundles of the project and its dependencies

unity-print-assetbundles.cs

     [MenuItem("AssetBundles/Print all Asset Bundle names")]
     static void PrintAssetBundlesToDebugConsole()
     {
         var sb = new StringBuilder();
         var globalTimer = new Stopwatch();
         var timer = new Stopwatch();

         globalTimer.Start();
         timer.Start();


         var assetBundles = new List<string>(AssetDatabase.GetAllAssetBundleNames());
         timer.Stop();

         sb.AppendLine($"Retrieved list of Asset Bundles: {assetBundles.Count} [{timer.ElapsedMilliseconds /1000.0}s]");
         timer.Reset();
         foreach(var assetBundle in assetBundles)
         {
             bool recursive = true;
             timer.Start();
             var dependencies = AssetDatabase.GetAssetBundleDependencies(assetBundle, recursive);
             timer.Stop();
             sb.AppendLine($"{assetBundle} [{timer.ElapsedMilliseconds /1000.0}s]");

             foreach(var dependency in dependencies)
             {
                 sb.AppendLine($"\t{dependency}");
             }
             timer.Reset();
         }
         globalTimer.Stop();
         sb.AppendLine($"Total elapsed time: [{globalTimer.ElapsedMilliseconds /1000.0}s]");

         Debug.Log(sb.ToString());
     }

Yep, it works con Unity 2018. Have you tried generating the assets once? Maybe Unity is using an internal database or something