They are not implemented!
To save your ass, PLEASE use one of package from Microsoft.Xbox.Live.SDK.WinRT.UWP.
// sign in
object dispatcher = null;
#if ENABLE_WINMD_SUPPORT
dispatcher = Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher;
#endif
var user = new XboxLiveUser();
var result = await user.SignInSilentlyAsync(dispatcher);
if (result.Status == SignInStatus.UserInteractionRequired)
await user.SignInAsync(dispatcher);
// create xbox live context
var context = new XboxLiveContext(user);
// achievement
var result = await context.AchievementService.GetAchievementsForTitleIdAsync(
xboxUserId: context.User.XboxUserId,
titleId: context.AppConfig.TitleId,
Microsoft.Xbox.Services.Achievements.AchievementType.All,
unlockedOnly: false,
orderBy: AchievementOrderBy.Default,
skipItems: 0,
maxItems: 100 // do NOT use MaxValue!
);
use VS2015 to build your UWP project


create and put a XboxServices.config into your UWA project
{
"PublisherId": "CN=XXXXXXXXX",
"PublisherDisplayName": "XXXX",
"PackageIdentityName": "XXXX",
"DisplayName": "XXXX",
"AppId": "XXXX",
"ProductFamilyName": "XXXX",
"PrimaryServiceConfigId": "00000000-0000-0000-0000-0000XXXXXX",
"TitleId": XXXXXX,
"Sandbox": "XXXXX"
}


associate your project to the correct store app and create cert


in order to connect script debugger, you also have to give private network privilege in capabilities of appxmanifest

They are not implemented!
To save your ass, PLEASE use one of package from Microsoft.Xbox.Live.SDK.WinRT.UWP.
use VS2015 to build your UWP project

create and put a
XboxServices.configinto your UWA project{ "PublisherId": "CN=XXXXXXXXX", "PublisherDisplayName": "XXXX", "PackageIdentityName": "XXXX", "DisplayName": "XXXX", "AppId": "XXXX", "ProductFamilyName": "XXXX", "PrimaryServiceConfigId": "00000000-0000-0000-0000-0000XXXXXX", "TitleId": XXXXXX, "Sandbox": "XXXXX" }associate your project to the correct store app and create cert


in order to connect script debugger, you also have to give private network privilege in capabilities of appxmanifest
