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Why not just add the games to your profile then mod the achievements?
If you're afraid of getting banned, don't be. It's highly unlikely that you'll get banned from modding a little bit of Gamer Score. If you go overboard, then yes, you may get banned.
Here's how you use the Game Adder:
The game adder tool is an extremely useful tool and is pretty simple to use. It adds game profiles to your game library that you don't already have. The tool has hundreds of games available to add, so if your looking to get more gamerscore than everyone else this tool will come in very handy when usedin conjunction with the achievement unlocker.
To use this tool: on your Xbox 360 > Dashboard > system settings > memory >find what device your profile is on > move it to your USB > Extract your profile using the device explorer > open your profile on the tool > add desired games.
Layout of Tool below:
On the top userbar there is 4 tabs - open, save, game list and queue.
When you click game list it shows you a list of all the games available in alphabetical order. It also shows you the title I.D of each game as well as the gamerscore available with that game and how much achievements the game has that are unlockable.
There’s also a search function in the bottom left hand side to make easier to fins a specific game.
To select a game to add to your library click on the game you want to add and select add to queue, it will add it to your queue along with any other game you have added.
Once satisfied with the games you want to add, click on the queue tab and you should see all the games you have added. You can remove any you don't want and when your satisfied you can click add queue to profile and the games should be added to your profile.
Remember to save before you exit or you'll lose all of your work.
When you open your Profile in the Achievement Unlocker, you will get something similar to this.
At the top of the Achievement Unlocker you will see this, it may not be the same, it probably will be a different game.
There are two buttons, "Unlock All Displayed" which unlocks all the Achievements for the Game which is currently highlighted. The other button is "Extract GPD", you'll need this if you are going to inject it to another Profile, or you can mod the game via GPD.
That is the game currently selected, you can select another game from the list dislayed on the left hand side.
This shows all the games currently on your Profile. If you have a lot of games on your Profile and you don't want to maunally search through the list. There is a search bar at the bottom for Game Titles or Game ID's.
If you select a game with a lot of Achievements and only want to unlocker a certain one, you can search it here
Once you select a game and find the Achievement(s) you want to unlock click them and it'll turn yellow
At the top now you will see something similar to this
This shows the details about the Achievement, it's Locked and Unlocked Description and the amount of Gamerscore it's worth. It's now up to you, to unlock it, Offline or Online.
If you choose to set it as Unlocked Offline you will not have to enter a date when it was unlocked, but if you unlock in Online you will. This is called a time stamp.
If you don't feel like doing any of that and your not really bothered about being reset, there is a button in the top right which will unlock every achievement for every game.
EDIT: You could try the TTG Gamesaves that Hero posted also.
But a gamesave won't unlock all achievements if you're talking about completion achievements, because the script that awards the achievement is triggered after the mission is completed. That's usually how a lot of games work.
That guy who ****ed off everybody with Pokemon and Jennifer Aniston
I dont want to risk my account being banned. If you mod your gs even slightly and someone files a complaint on system tampering, cheating, ect. wont you get banned?
Like I said I been using Horizon for multiple things from modifying games, profile editing etc. And I have never been banned for it, you should be safe to use the Achievement Unlocker, only unlock the achievements that you really want unlocked and not unlocking everything by doing that you should be safe.
They're most likely not going to know that you modded the achievements, just don't tell anyone, you should and most likely will be fine.
thing is im a fairly good Halo player im #67 Overall on Halotracker.com and as you can imagine i play with hundreds of players everyday and my friends and i spawn kill kids and when they are ****ed they file complaints because its the only thing they can think to do with no real grounds as we arent breaking any rules but if someone files a complaint whats the likeliness of me getting caught with modded achievements if i only did a few here and there?
Well there is always a risk in modding, I have unlocked every single achievement on Halo 3 using Horizon.
I doubt you would get banned for unlocking achievements, at the most it would be a 2 week suspension.