NBA 2K8 Codes -

Cheat Mode
In the Main Menu go to "Features", then go to the "Codes" menu and enter the following codes:

payrespect - Unlocks the ABA ball
2ksports - Unlocks 2KSports Team

Achievements
Complete each achievement to get the allotted gamerscore:

10 Online Ranked Wins (25) - Win 10 online ranked games.
15 Blocks (20) - Record 15 blocks or more with any team.
15 Steals (20) - Record 15 steals or more with any team.
15 Threes (15) - Make 15 three pointers or more with any team.
20 Online Ranked Wins (35) - Win 20 online ranked games.
2K Beats Playlist (10) - Create a 2K Beats playlist.
3 Online Ranked Streak (15) - Win 3 online ranked games in a row.
3-For-All (20) - Make at least 10 3pt FG's while shooting at least 45% from 3pt range with any team.
30 Assists (20) - Record 30 assists or more with any team.
3pt Shootout (25) - Win the 3pt Shootout.
5 Online Ranked Streak (20) - Win 5 online ranked games in a row.
5 Online Ranked Wins (15) - Win 5 online ranked games.
All-Heart (15) - Start the 4th period losing by 10 or more points and win the game with any team.
All-Hustle (15) - Record at least 10 offensive rebounds, 5 blocks and 5 steals with any team.
Allen Iverson (25) - Record at least 30 points, 10 assists and 5 steals with Allen Iverson.
Carmelo Anthony (25) - Record at least 40 points and 8 rebounds with Carmelo Anthony.
Chris Bosh (25) - Record at least 30 points, 15 rebounds and 2 blocks with Chris Bosh.
Chris Paul (25) - Record at least 25 points, 10 assists and 5 steals with Chris Paul.
Create Player (10) - Use the Create Player feature.
Defensive FG% (15) - Hold the opposing team's FG% below 40% with any team.
Dwight Howard (25) - Record at least 20 points, 15 rebounds and 5 blocks with Dwight Howard.
Dwyane Wade (25) - Record at least 30 points, 9 rebounds and 9 assists with Dwyane Wade.
East vs West (15) - User controlled team must win this matchup on All-Star difficulty.
Gilbert Arenas (25) - Record at least 35 points, 5 steals and 5 threes with Gilbert Arenas.
Good Hands (20) - Record 20 assists with no more than 5 turnovers with any team.
Ice Water (15) - FT% over 85% with at least 15 FTA's with any team.
Inside Domination (20) - Score at least 60 points in the paint with any team.
Kevin Garnett (25) - Record at least 25 points, 15 rebounds and 7 assists with Kevin Garnett.
Kobe Bryant (25) - Record at least 40 points, 5 rebounds and 5 assists with Kobe Bryant.
Kobe Bryant Dunk-Off (35) - Defeat Kobe Bryant in a Dunk-Off.
Lakers vs Clippers (15) - User controlled team must win this matchup on All-Star difficulty.
LeBron James (25) - Record at least 35 points, 7 rebounds and 7 assists with LeBron James.
Lights Out (15) - FG% over 55% for the game [minimum 40 FGA's] with any team.
Lockdown (20) - Record at least 10 blocks and 10 steals with any team.
Online Draft League (10) - Participate in an online draft.
Online League Game (15) - Complete an online league game.
Online Ranked Game (15) - Win one online ranked game.
Online Ranked NBA Blacktop Game (15) - Win one online ranked NBA Blacktop game.
Online Tournament Game (15) - Complete an online tournament game.
Pistons vs Heat (15) - User controlled team must win this matchup on All-Star difficulty.
Rebound Margin +7 (20) - Win the rebound battle by a margin of +7 with any team.
Second Unit (15) - Score at least 40 bench points with any team.
Sprite Slam Dunk (35) - Win the Sprite Slam Dunk Contest using LeBron James.
Spurs vs Mavericks (15) - User controlled team must win this matchup on All-Star difficulty.
Steve Nash (25) - Record at least 20 points and 15 assists with Steve Nash.
Suns vs Lakers (15) - User controlled team must win this matchup on All-Star difficulty.
Suns vs Mavericks (15) - User controlled team must win this matchup on All-Star difficulty.
Track Meet (15) - Score at least 15 fastbreak points with any team.
Trivia (35) - Answer 30 trivia questions correctly.
Yao Ming (25) - Record at least 30 points, 15 rebounds and 5 blocks with Yao Ming.