Here are all the achivements

The Champion (20) Complete All Bike Races.
It's All in the Wrists (20) Complete All 4 of the Carnival Games once.
Teacher's Pet (20) Complete 6 Classes.
Keener (20) Complete 3 Classes.
Little Angel (20) Complete 20 Errand Missions.
Helping Hand (20) Complete 10 Errand Missions.
Speed Freak (20) Complete ½ of all Go Kart Races.
Soda-licious (20) Buy 100 sodas.
Down for the Count (20) Beat up 200 opponents.
Dual Nebula (20) Achieve A High Score on Consumo, Nut Shots, and Monkey Fling Arcade Games.
Watch Your Step (20) Trip 25 people with marbles.
Kickin' the Balls (20) Kick 100 soccer balls.
Eggsellent! (20) Egg 25 cars.
Casanova (20) Receive 25 kisses from the ladies.
Green Thumbs Up (20) Pick 50 flowers.
After Hours (20) Spend 5 hours out after curfew.
Pole Position (20) Complete All Go Kart Races.
Green Thumb (20) Complete All Lawn Mowing Jobs.
Black & White & Read All Over (20) Complete All Paper Route Missions.
Freshman (20) Complete Chapter 1.
Sophomore (20) Complete Chapter 2.
Junior (20) Complete Chapter 3.
Senior (20) Complete Chapter 4.
Skate Pro (25) Travel 50,000 meters on the skateboard.
Smart Mouth (25) Say 100 taunts.
Smell Ya Later (25) Hit people with stink bombs 50 times.
Skidmark (25) Give 50 wedgies.
Glass Dismissed (25) Break 300 bottles at the shooting gallery.
Momma's Boy (25) Complete 30 Errand Missions.
Marathon (25) Travel 100,000 meters on foot.
The Wheel Deal (25) Perform 200 wheelies on the bike.
Sharp Dressed Man (25) Collect 250 clothing items.
Tour De Bullworth (25) Travel 100 km on the bike.
Boy Genius (30) Complete 9 Classes.
Graduate (40) Complete Chapter 5.
Mission Accomplished (75) Complete All Missions.
Perfectionist (125) 100% completion.
Over the Rainbow (20) Receive 20 kisses from the gents.


here are all the cheats

hold LB and press RT, RT, RT Full Health (not the extra from kissing)
hold LB and press UP, UP, UP, UP on the D-Pad All Weapons
hold LB and press UP, DOWN, UP, DOWN Infinite Ammo (enter again to turn off)
Hold LB and press Y, X, B, A Massive Money Gain
Hold LB and press up,left,down,right,Y,X,A,B All Hobo Moves
Hold LB and press up,left,down,down,Y,X,A,A All Gym Grapple Moves