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

# XblAchievementUnlockHandler

> 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\*](/reference/live/xsapi-c/achievements_c/structs/xblachievementunlockevent)

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.14x.GDK.C.lib

## See also

[achievements\_c](/reference/live/xsapi-c/achievements_c/achievements_c_members)


## Related topics

- [XblAchievementUnlockAddNotificationHandler](/reference/live/xsapi-c/achievements_c/functions/xblachievementunlockaddnotificationhandler.md)
- [XblAchievementUnlockRemoveNotificationHandler](/reference/live/xsapi-c/achievements_c/functions/xblachievementunlockremovenotificationhandler.md)
- [XblAchievementUnlockEvent](/reference/live/xsapi-c/achievements_c/structs/xblachievementunlockevent.md)
- [XblAchievementsAddAchievementProgressChangeHandler](/reference/live/xsapi-c/achievements_c/functions/xblachievementsaddachievementprogresschangehandler.md)
- [XblAchievementsRemoveAchievementProgressChangeHandler](/reference/live/xsapi-c/achievements_c/functions/xblachievementsremoveachievementprogresschangehandler.md)