You don't have to do the goals at all Gale, they are simply for added fun (I actually found some written up for Nano and was inspired by that) since Nano is actually very easy for some people it adds a little UMPH!
Again, you don't have to do them at all. I am waiting on a reply from Goss regarding medals for NaJu. IF there are medals you can earn a medal by;
A) Completing NaJu (The word count)
and/or
B) Completing the word count AND the situational goals
That means that there are TWO medals you could potentially earn, IF it is approved by Goss.
Note: If you want to try for both the word count and the goals but you want to be able to include as many of the goals as you want in a thread you can totally do that but you wont be eligible for the situational medal. You will however still be eligible for the NaJu medal and can still say you completed NaJu.
This is assuming that a NaJu medal is approved.
Edit: I bolded the explanation on the previous post. YOU DO NOT NEED TO DO THE GOALS!
They are just for fun. Repeat, since I have gotten several PMs regarding this. YOU DO NOT NEED TO DO THE GOALS TO COMPLETE NAJU! <3 *no angry voice, just emphasis voice*