NASCAR 08 Cheats

Unlock Bonus Wal-Mart Car
Enter the password at the cheat code section in the menu:

WALMART EVERYDAY: Bonus Wal-Mart Car
Race The Pack: All fantasy drivers
EA SPORTS CAR: EA Sports Car
checkered flag: All Chase Mode Cars unlocked

Achievements
Complete each achievement to get the allotted gamerscore.

3 Wide (10): Earn Three Gold Medals in "The Chase" Mode.
All Or Nothing (100): Reach 100% Game Progress.
Badge Of Honor (10): Complete a Driver Badge.
Chase Champion (100): Win a NEXTEL Cup in "The Chase" Mode.
Chase For The Cup (25): Win a Championship in Season Mode using the Car of Tomorrow Series Full Schedule.
Craftsman Tools Reward (50): Save a Craftsman Tools Car Setup at any Track.
Cross Country (100): Drive 5,000 Total Miles.
Custom Car Creator (10): Complete a Custom Car for all racing series.
Earn Your Stripes (25): Earn a License in "The Chase" Mode.
Full Throttle (100): Complete a 100% Length Race in Race Now or Season Mode.
Heavy Medal (10): Win a Medal in "The Chase" Mode.
Independent Contractor (25): Earn a Contract in "The Chase" Mode.
Keep On Truckin' (10): Win a Craftsman Truck Series race.
Licensed To Drive (25): Complete all Licenses in "The Chase" Mode.
National Hero (10): Win a NASCAR National Series race.
Online Horsepower (25): Win an Online Race.
Pay The Bills (100): Complete all Contracts in "The Chase" Mode.
Play It Again, Sam. (10): Save a Race Replay.
Sprint Reward (75): Win a NEXTEL Cup in Season Mode using the NEXTEL Cup Series '07 Schedule.
Today Or Tomorrow? (10): Win a NASCAR Car of Tomorrow race.
Toyota Reward (50): Complete all Toyota Challenges.
Trade Your Setup (10): Upload a Car Setup to EA Locker.
We Don't Need No Badges! (100): Earn all Driver Badges.
We're Talkin' About Practice (10): Record a Lap in Toyota "Test and Tune" Mode.