Ghosts - First you need to go and build the Aetherscope. Now go back into the Dark Aether and go into the Medical Bay and in the room next to box you can pick up a diary next to a computer. Now go directly below this and interact with the ghost. You have to interact with it twice. Now go to the Control Room and interact with the ghost there twice. Now the final ghost will be infront of the Aetherscope crafting table and interact with it twice. Finally, wait for the Dark Aether to deactivate and go back to where the diary was and interact with the computer. Now you can get ammo.
Electrobolt Ammo - Do the steps to get the free D.I.E Shockwave. When you have the D.I.E go to the Particle Accelerator room and enter the Dark Aether portal under the Pack-a-punch. Now in the Dark Aether, go to the upper part of the map and look for three crystals. You can only do one crystal at a time. Once you find one, use the suck with the D.I.E until it doesn't have its yellow glow anymore.The first spawn is right of the entrance to the underground, in the area with a plane wing, and you can find it on a box. The second spawn is on the roof of Nacht Der Untoten to the right of the Wunderfizz machine. The third spawn is found in the Pond to the right of the mystery box. Now that you have sucked one of the crystals do not shoot. Go back down to the Particle Accelerator room, and go to the bottom of the room and on the left side of the Pack-a-punch machine, in the back corner there should be a small box next to a fence. Now shoot that box with your D.I.E. Now enter the Dark Aether again and go back up and find another crystal and then shoot that box again and then do that for the final crystal. Now open up the box and your ammo should now be electric.
Gas Ammo - Get the free D.I.E Shockwave and go to Nacht Der Untoten. Now go to the middle floor and there should be a section with a hole in the ground and lots of debris. Across the debris there should be a highlighted canister which you have to use the suck from the D.I.E to get it then pick it up. Now take it to Deadshot’s machine and to the right of the machine, all the way to the wall at the end you should be able to interact with a pump. Now you will have to kill a few plaque hounds directly in front of it so that it can take in the gas. Once it's filled, pick it up and go into the plane wing area of the map. There should be a box with vines, on the wall across from Juggernog. Interact with it and then shoot the canister. Now pull out your D.I.E and interact with the box.
Fire Ammo - Get the free D.I.E Shockwave and then go to the part of the map with the plane parts. Go to the part that is just the front of the plane and there should be a small box that you need to shoot and the top should flip open. Now go enter the Dark Aether. Go back to that head of the plane and the box that you should be on the ground and you need to interact with it to pick up a fuse. Now make sure you are back in the Dark Aether and go down to Deadshot and on the wall across from the machine there should be something you can interact with. If it didn't spawn trying going into the Dark Aether a few times then go back. Now it should start lasering the box. Go back up the pond area of the map and go on top of the truck and the box should be there which you need to to interact with and your ammo should be fire.
Ice Ammo - Get the free D.I.E Shockwave and go to the top of Nacht Der Untoten. On the wall above the ramp to get there should be a box that you need to shoot with the D.I.E. Now there should be a flask in the pond area right below where the box was. Pick that up. Wait until a Megaton spawns then have it shoot the tree with fungus on it at the main entrance to the Pond. You know it's been hit when it turns purple and there is an audio queue. Now go to the fungus and place the flask there. Now wait a few minutes or go a few rounds and the flask should be under the fungus for you to pick up. Now go to the room with Speed Cola and on the wall to enter the Particle Accelerator room there should be a box to interact with. Now you should have the ice ammo.