Minecraft: Edition

Start a game on Survival and make the difficulty Easy.

On normal more monsters will spawn but will be more difficult to kill. On hard even more monsters will spawn and they will be even harder. You can make the difficulty whatever you want really...

During the day just go around getting wood, iron, gold, diamond, etc.....and make a sword
When it is night time just be outside and find a monster and hit it with (RT) until it dies.

Some of the monsters are
Zombie (common)
Skeleton (common)
Spider (common)
Creeper (these blow up so hit them once and run) (common)
Slime (common)
Ghast
Blaze
Magma Cube
Cave Spider
SilverFish
EnderDragon
Wither Skeleton
Zombie Villager

For this you'll need to kill one of those baddies of the night. Zombies, skeleton archers, and creepers are your targets for this achievement. You'll have to wait until they spawn at night and you cannot be on peaceful difficulty. To make this guide easier be sure to have a sword on you, as they do alot of damage on MOB's. All you have to do is go toe-to-toe with one of these monsters and if you win you'll pop this 20 15G achievement!


.^{Solution originally provided by Murder of Birds}.

The easiest way to do this is to craft a stone sword early in the game and then wait until nightfall. Unless you have the game on the easiest difficulty setting, monsters will appear.

Simply approach a monster (zombies work well) and attack the monster by hitting RT on a Xbox controller, the achievement should then pop up. Subscribe to XDriftX and if you need help getting any achievements or want to boost let me know here or my gamertag - Skillz Voltage

There are several types of monsters in Minecraft, they can be found either in caves, the Nether, or on the surface at night. Go up to one and start hitting it with , if you're lucky you should be able to kill it! This is best done with some type of sword in your hand. Be sure to play in easy difficulty or higher for them to spawn.

Source:
https://www.xboxachievements.com/game/minecraft-windows-10-e...
All credit goes to the original writer.

Here's a video: