> ## 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.

# XblAchievementUnlockHandler

> XblAchievementUnlockHandler

Handle for Function handling achievement unlock events.

## Syntax

```cpp theme={null}
void XblAchievementUnlockHandler(  
         const XblAchievementUnlockEvent* args,  
         void* context  
)  
```

### Parameters

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

An achievement unlock event.

*context*   \_In\_opt\_\
Type: void\*

Caller context to be passed the handler.

### Return value

Type: void

## Remarks

The lifetime of the XblAchievementUnlockEvent object is limited to the callback.

## 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

- [XblAchievementUnlockAddNotificationHandler](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/functions/xblachievementunlockaddnotificationhandler.md)
- [achievements_c (contents)](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/achievements_c_members.md)
- [XblAchievementUnlockRemoveNotificationHandler](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/functions/xblachievementunlockremovenotificationhandler.md)
- [XblAchievementUnlockEvent](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievementunlockevent.md)
- [XblAchievementsAddAchievementProgressChangeHandler](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/functions/xblachievementsaddachievementprogresschangehandler.md)