Hi Lunlun, the achievement page is private only to you. It shows only your achievements. No one can see yours and you can’t see anyone else’s… if that’s not the case let me know!!
The linkedIn sharing is totally optional, and because the way LinkedIn works you will be required to manually fill out some of the course info to post it to your profile. This is a limitation of LI, not of the learning portal.
Thanks for learning with us!