The changelog said that you can unlock achievements with add-ons installed, but it seems that it is actually limited to marketplace add-ons.
This seems like a deliberate design for game balance, but it's very inconvenient for me.
The above text was translated using Google Translate, so there may be some unnatural parts.
Linked issues
is duplicated by 9
MCPE-190932
Behavior pack bug
Resolved
MCPE-194212
World disabling achievements with add-ons
Resolved
MCPE-194276
Addons take away achievements
Resolved
MCPE-194309
Addons disabling achievements that aren't from the marketplace
Resolved
MCPE-194353
Addons downloaded from websites and not in the marketplace still disables achievements
Resolved
4 more links
As mentioned by @SmokeyStack_ on twitter, existing Add-Ons that are not from the marketplace will need to update their manifest to include a
product_type.Maybe Mojang will provide a way for no longer updated Add-Ons to easily bypass this without the need for modification, or maybe they will not, but third-party Add-Ons can definitely have achievement support.