A.M.R.: The sequel "Shadow of War" has just been released today, only now I noticed achievements aren't featured in it.
Wonder if they will be added later or not at all
The first game was affected by the phenomenon known as "invisible achievements": they were working, but you could only see the ones you unlocked. There is a simple option in the developers' backend that allows them to make them normally visible, so the problem was quickly fixed.
If Shadow of War has the same problem, all it would take is for someone to try to unlock an achievement, so we would know if they are invisible but working, or if they are just not there.