The achievement of 1km in minecart is impossible to do

Why don't you post a video or at least some screenshots?

Because?

Ride a minecart in a loop for at least 10 full Minecraft days or more?

@Tom Lee

facepalm

The On A Rail achievement is only obtainable by traveling on a continuous rail in a single direction for a full 1,000 blocks, no stops, no breaks.

There needs a vote-down button here, along with a rule requiring that "bugs" are first checked to actually be bugs. Please use minecraftwiki.net to learn how Minecraft works before assuming that everything is a bug and flooding this site with malarky.

Actually I just got this achievement today. And more specifically it doesn't have to be just in a single direction and you can stop or break in the middle if you don't leave the minecart, however tge point you reach by rail must be 1000 blocks away from your starting point along the x or z axis.