This walkthrough will be explaining to you the simplest way to achieve the full 1k in one go.
I will be concentrating on the 20 rebounds with one player achievement as this is the most important achievement in the game since achieving it will get you: 15 3-pointers, 50 points with one player and a triple-double with one player along the way. Then all that will be left is to get a further 80 points to get 140 points in one game (20rebounds all scoring 3-pointers= 60 + 80 more points)
Luckily to make the game easier you can adjust the game's setting sliders to boost your team and punish the AI team. (I will go in detail of this in the Hints page) Along with this we will be turning off the NBA rules to allow us to 'cheat' the game.
Please note that the achievements for the game do not unlock until the end of the match, however the game does have it's own in game pop ups that are tied to the achievements.
By following this walkthrough you will get to see 'Achievement Unlocked - 5 for 1000G' pop up!
Ill start by saying the game will be far easier if you have a second controller that you can use for the other team but with the sliders in your favour the AI will be a push over to beat.
Settings, Sliders and NBA Rules
From the main menu head into the 'Options' menu and then 'Gameplay'.
Change the difficulty to ROOKIE and the Quarter length to something you feel comfortable with, 8 Minutes should be plenty. Personally i got all the requirements done within 6minute halves but its best to have too much time than not enough.
Head back into options and select 'Game Sliders' and change the following sliders, Press RT to change between each slider type. Max being all the way right and Min being all the way left.
Shooting - Home/User Settings
Close Shot Success - MAX
Mid-range Success - MAX
3PT Success - MAX
Dunk Success - MAX
Layup Success - MAX
FreeThrow Success - MAX
Close Shot Tendencies - MAX
Mid-range Tendencies - MAX
3PT Tendencies - MAX
Drive Tendencies - MAX
Dunk Tendencies - MAX
Dunk in Traffic - MAX
Stealing - Home/User Settings
Rip Success - MAX
Defence - Home/User Settings
Pick Success - MAX
Pick Strength - MAX
Attributes - Home/User Settings
Steal - MAX
Block - MAX
Ball Handling - MAX
Dunk - MAX
Offensive Awareness - MAX
Defensive Awareness - MAX
Offensive Rebounding - MAX
Defensive Rebounding - MAX
Injury Chance - MIN
Injury Effect - MIN
Clutch Factor - MAX
Now that's the User settings done, still on this screen press the start button to change to the Away/CPU Settings and set ALL sliders to MIN.
Enter back into the options menu and this time go into 'NBA Rules' and change the following rules:
Shot Clock - OFF
Out Of Bounds - OFF
Backcourt - OFF
8 Sec Half Court - OFF
3 in the key - OFF
Def 3 in the key - OFF
5 Sec Back To Basket - OFF
Now for the last time in the options menu head into 'Coach Settings' and turn Timeout and Substitutions to MANUAL.
The game is now setup for you to have one hell of an easy game.
Here is a video showing the settings getting set up
Control tips
Press 
to run
Press 
to shoot (Hold for a perfect 3-pointer)
Use the 
to steal the ball off your opponent
Press 
to pass the ball between players (To find your main player)
During the game you can check on your progress by entering the pause menu and going into 'Game Stats' and 'Home Team'. From here you can see all of the Points, Offensive Rebounds, Rebounds (This is the one you want to keep track of), Assists and Steals for each player.
Having made the changes listed in the 'General hints and tips' page we are all set to begin.
Setup a 'Quick Game' with the following teams:
Home(You) : East 2005
Away(AI/Second controller) : Raptors
Before you start decide which player you are going to use for all the achievements, i used - Lebron James
Once the game begins you will fight the opposition for possession of the ball, once you win and the ball is in play run back to your net and face the post, press to throw the ball and it will hit and rebound off the basket and your player should automatically pick up the ball 99% of the time. The ball is now a rebound, run to the opposition's net and shoot (Hold ) outside of the red line to score a 3-pointer.
Now the ball will be in the opposition's possession so run up and steal the ball with your player using the and repeat the process of rebounding off your own basket and getting a 3-pointer, do this until your player has reached 20 rebounds.
Doing so your player should have 20 rebounds, 60 points (20 3-pointers) and 19 steals, which will give you a 'Triple-Double'
Note the game does have it's own pop ups to tell you when criteria has been reached, look out for the achievement ones popping up.
Now all that is left is to score 80 more points with your team (Any player can now score) and you will have met the requirements for all 5 achievements, try to score 3-pointers where possible to speed it up.
Depending on how much time you have left on the timer just sit in your own half of the court to let the time run down and the 5 achievements will pop together at the end of the game.
I understand that can be confusing so here is a video walking you through the process.
Note i do use a second controller but that's only to make the video easier.
Congratulations on your easy 1000G