When my cousin booted up his realm today, he found that he had his achievements disabled. He opened the same world he had that still had achievements enabled and added the add-ons and he got an achievement.
Steps to Reproduce:
1: Create a new Survival World with achievements enabled.
2: Download a copy of that world into Minecraft Realms.
3: Add any add-on to both Worlds. (We use specifically “Cave Dweller“, “Actions and Stuff” and “RPG Skills Add-on”)
4: Separately enter both worlds and earn an achievement.
Expected Result:
Both worlds grant the achievement
Actual Result:
The Non Realm world has achievements enabled and the realm world does not grant any achievements.
Side notes: I Was unable to search to see if this a duplicate result due to the search feature on the site being broken. If this is a duplicate, please inform me as soon as you see this! Also, i would ask my cousin to report this, but he REFUSES to use this site. i can contact him directly for details.
Environment
All Platforms
This issue is being tracked at MCPE-218472.