Nic21

First, you need to have 100% relationships with Darius and Polly Nomial to unlock the missions.

Streeties:

-Seriously annoy Daddy Bigbuckss (relationship -50)
This works best once you've finished the game. Go to the nutria island
Or paradise island (the one with the woman selling beds and stuff).
You'll have to do this a number of times, as eventually he'll tell
You to go away and won't talk anymore.

-Convince someone to join the Streeties
For this goal, get relationship 50 with Ewan Watahmee.

-Get the highest promotion in Basketball
Work work work. That's all you can do.

Nerdies

-Get best promotion in Dr. Max Stat minigame
Keep trying. I find this game easier if I turn the sound off.

-create a petrified wood chess piece
This will take you a while. You can get petrified wood from Paradise
Island or from the tunnel in the jail (get 100 relationship with Dan
D. Mann).

-sell 15 giant bog frogs to the deputy
Look for these in the bayou. They'll show up occasionally in Glasstown
And the Graveyard, but not very often