Two bugs have seem to rear its ugly head on the current version of Minecraft Windows 10 Edition, these are all achievement bugs.
Note this is for Windows 10 only and affects pretty much all versions.
1. Renewable Energy -10G
Summary - Will not unlock, tried a lot of Youtube methods to no avail. Requires smelting a tree log to turn to charcoal, Then using the charcoal to smelt a tree log.
2. You need a Mint - 30G
Summary - When the dragon breathes or fires his breath on the floor you have to pick it up with an empty bottle, not obtainable, tried both methods to no avail.
This is pretty much it for this bug report.