> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XblAchievementsProgressChangeHandler

> XblAchievementsProgressChangeHandler

A callback invoked when a progress is made on an achievement.

## Syntax

```cpp theme={null}
void XblAchievementsProgressChangeHandler(  
         const XblAchievementProgressChangeEventArgs* eventArgs,  
         void* context  
)  
```

### Parameters

*eventArgs*   \_In\_\
Type: [XblAchievementProgressChangeEventArgs\*](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievementprogresschangeeventargs.md)

The arguments associated with the change in achievement state. The fields of the struct are only valid during the callback.

*context*   \_In\_opt\_\
Type: void\*

Context provided by when the handler is added.

### Return value

Type: void

## Remarks

For the callback to work properly, you must be subscribed to achievement progress changes for at least one user.

## Requirements

**Header:** achievements\_c.h

**Library:** Microsoft.Xbox.Services.142.C.lib or Microsoft.Xbox.Services.143.C.lib

## See also

[achievements\_c](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/achievements_c_members.md)


## Related topics

- [XblAchievementsAddAchievementProgressChangeHandler](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/functions/xblachievementsaddachievementprogresschangehandler.md)
- [achievements_c (contents)](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/achievements_c_members.md)
- [XblAchievementsRemoveAchievementProgressChangeHandler](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/functions/xblachievementsremoveachievementprogresschangehandler.md)
- [XblAchievementProgressChangeEntry](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievementprogresschangeentry.md)
- [XblAchievementProgressChangeEventArgs](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievementprogresschangeeventargs.md)