There is no guide for this game yet. But apparently it is EASY POINTS! 

Please note: There are cheats for this game that do not affect achievements click here 

After Hours - 20 points

5 hours out after curfew

Green Thumbs Up- 20 points

Pick 50 flowers

Casanova - 20 points

Receive 25 kisses

Over the Rainbow - 20 points

Receive 20 kisses from the gents.

Eggselent! - 20 points

Egg 25 cars

Kickin' the Balls - 20 points

Kick 100 soccer balls

Watch Your Step - 20 points

Trip 25 people with marbles

Dual Nebula - 20 points

Achieve a high score on Consumo, Nut Shots and Monkey Fling Arcade Games

Down for the Count - 20 points

Beat up 200 opponents

Soda 'licious - 20 points

Buy 100 sodas

Speed Freak - 20 points

Complete ½ of Go-kart races

Helping Hand - 20 points

10 errand missions

Little Angel - 20 points

20 errand missions

Keener - 20 points

Complete 3 classes

Teacher's Pet - 20 points

Complete 6 classes

It's All in the Wrists - 20 points

4 carnival games at once

The Champion - 20 points

All bike races

Pole Position - 20 points

All Go-kart races

Green Thumb - 20 points

All lawn mowing jobs

Black & White and Read All Over - 20 points

All paper route jobs

Freshman - 20 points

Complete chapter 1

Sophomore - 20 points

Complete chapter 2

Junior - 20 points

Complete chapter 3

Senior - 20 points

Complete chapter 4

Skate Pro - 25 points

Travel 50,000 meters

Smart Mouth - 25 points

Say 100 taunts

Smell Ya Later - 25 points

50 people hit with stink bomb

Skid mark - 25 points

50 wedgies

Glass Dismissed - 25 points

300 shooting gallery bottles

Momma's Boy - 25 points

30 errand missions

Marathon - 25 points

100,000 meters on foot

The Wheel Deal - 25 points

200 wheelies

Sharp Dressed Man - 25 points

200 clothing items

Tour de Bullworth - 25 points

Travel 100 km on bike

Boy Genius - 30 points

Complete 9 classes

Graduate - 40 points

Complete Chapter 5

Mission Accomplished - 75 points

Complete all missions

Perfectionist - 125 points

100% completion