One question: Being noob at OS stuff, I feel quite impressed that bash and GCC could work on the Linux that Linus built on his own. But everybody says that Linux really was something interesting as soon as a proper memory management was added to it. And that was done, but not by Linus. So, which achievement sounds to you the most impressive? Building the first Linux? Or adding that (afaiu, critical) memory management…
Linus himself implemented virtual memory support with paging to disc in Linux version 0.12 (Jan 1992). This made people to switch from Minix to Linux.
Maybe you mix it up with some other important feature? X was ported to Linux by Orest Zborowski in 92. Or networking? That was not a one-man show.