[MCPE-25632] Impossible unlock achievements on Minecraft Better Together

About the game, there are three achivements that are not obtainable :

Sniper Duel - Kill a Skeleton with an arrow from more than 50 meters.

Inception - Push a piston with a piston, then pull the original piston with that piston.

So I Got That Going for Me - Lead a Caravan containing at least 5 Llamas