It does seem like the string theory achievement broke when I went to port the mod to the latest version.
As for the dream it is from the mod. It looks like I forgot to disable it after I was done testing. That dream sequence probably won't be done for a bit, but the first dream will be in the next update.
I'm going to try to get a bug fix out in a few days (or tomorrow if the string theory problem is simple to fix).
Thanks for reporting :)