Go to https://partner.microsoft.com/en-us/

Click App and games → your app → Gameplay Settings

Select the tab of your SANDBOX

1. Select Achievements
2. Click New Achievement
3. Fill out achievement form
   1. Click use placeholder image if you don’t have one
4. Save achievement

NOTE: Achievements published to Cert/Retail cannot be modified!

Publish to your SANDBOX

Go to your scriptable object and assign the Xbox Identifier (ID)

Test on an xbox in your sandbox environment