I created an Operator with the "Item Enchantable" predicate, stored the variable in the Export Item Predicate of an item exporter connected to an iron chest. My network has an item interface with an attached chest. If I store a pick axe in the chest attached to the interface, the pick transfers in the chest attached to the item exporter. If I store something not enchantable in the interface chest, the item remains in the chest and is not exported. Although I think I completed it, the achievement remains uncompleted in the book. I tried putting the predicate in an importer instead, which imported enchantable items into the interface chest. I also copied the predicate and had one in both importer and exporter. Enchantable items transfer from one chest to the other, but the achievement remains uncompleted. I really don't know what to try next.

I am playing Sky Factory 3.0.13, so running Minecraft 1.10.2. Integrated Dyanics version 0.7.3, Integrated Tunnels version 1.2.1.

The way you did it sounds correct.

Are you using 1.10.2? I'll look into it then.

Are you sure you used the "Item Enchantable" operator, and not "Item Enchanted" operator?
I just tried it myself, and the achievement is obtained just fine.

I double checked I use the "enchantable" predicate. I restarted from scratch with a network containing just an item interface, an item exporter, and vanilla chests attached to the interface and exporter (I was using a royal chest and an iron chest before). Still no luck. I tried to put other items than pick axes in the chest linked to the interface: nether quartz (not transferred, correct), chest plate (transferred because enchantable). Achievement still does not unlock. Seems some other mod in Sky Factory 3 is interfering and preventing that achievement to complete.

@EricBuist Would it be possible to send me a short video of you showing the process? Perhaps I am making some assumptions. (Note that the achievement should unlock when you insert the variable into the exporter)

Cannot upload a video: either the format is incorrect, either it is too big. Seems I have less and less luck with computers in general, I'm having a lot of issues no matter what I'm trying. I looked at the source code and there is no reason why the achievement does not unlock. I guess I have to either start a new map in another modpack or just edit the stats.json in my world to manually unlock this particular achievement.

Yeah, GitHub won't accept videos, you can probably do it with a private video on YouTube.

Hmm, I see. Everything you are doing seems correct.

I see that your pack is using an outdated version of ID though, so updating to the latest ID+IT versions might solve the issue.

Thanks for the investigation. That's kind of bad news, meaning I'll have to either figure out how to customize modpacks (this is not documented clearly anywhere) to upgrade the mods, or start from scratch on a new pack with more up-to-date mods. At least I will stop trying to complete this achievement in Sky Factory 3, knowing it won't work, and that's not a blocking issue.