Here's a methode on how to unlock Artificial Selection, Great View from Up Here and Inception:
1-go to this website
https://minecraft-pe.fr.aptoide.com/versions?offset=30 then download 0.16.0.5 version
2-once the download is completed sign in with your acc and finish all the requirements for the achivements and they should unlock without any problem....and make sure to enbale(do not auto update apps) in google play before you start downloading,hope it helps and srry for my english :)