Here's some objects that you can spawn to produce some interesting results.

Note that if you spawn a map, it might mess with the camera and it doesn't remove the previous map. So be careful. Also keep in mind it might be case sensitive, but I put what I found in the game files the objects I could find.

Ph: Spawns the portal that leads to the Uncharted Territory Map. That will most likely grant the achievement, you can just spawn the map in the "Abyss" map. Though this 'properly' causes the map to transition properly as if you did the experiment.
Uncharted: Spawns the Uncharted Territory Map itself. Yes, the maps are also spawnable, they are prefabs. I haven't tested, but I don't think the radios will spawn, just the map, the alarm and the lights.
Any Map's 'Internal' name: The map itself. Though some might have a different name from in-game. Blocks will spawn Blocks, etc. Camera will try to follow that map. Might break camera if multiple maps are spawned.
Holle Man: The audio object that makes the Abyss pit sounds.
ep: Spawns the effect used in the "Inverse Teleportation" experiment, spawns the Real Gun after a bit.

Human: Spawns a human arm relative to another (seems random?) object. Nothing else.
Android: I think it does the same thing, just with an android arm instead.

Unfinished? Unimplemented? Or just broken?
Portal: There is a "portal" object and by what I can see it might be like... portals that work like from Portal? Or a teleporter? Or it could be an internal thing used by the wormhole object, I can't seem to get it to spawn.
Red LED Lightbulb: I can't get it to spawn. I kept hitting random and it popped up but it didn't do anything.
Real Gun: Nothing? ep does the job though.
Gun: Also nothing?
Valley: Sadly nothing. Was hoping maybe the map was still in the game files but unfortunately no.