Ok so this bug has been happenning since the 1.16.0 now and maybe even before that. So the bug is that the achievements are never loading their textures. They are just a grey person and a ?.
How to reproduce:
Start up Minecraft.
Wait for your skin to load.
Go onto your profile.
Go onto Achievements.
Expected results: The achievements will have pictures.
Observed results: They just have a grey person and a ?.
Thank you for your report!
We're actually already tracking this issue at MCPE-83294, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki