Since you have a skeleton spawner, that should make it easier.
What I would do is build a wall/fence around it so that skeletons are contained, and leave some holes for you to shoot through.
Next, if looking through the holes does not activate the monster spawner, I would have a doorway that leads inside the spawner room to activate it, then run out.
The building will ensure that the skeletons do not wander off.
To kill the skeleton, first hit it with a sword through the hole until it's one hit away from death.
Then, back off 50 blocks and snipe it!
gaming.stackexchange.com/users/10616/Joe the Person
I think it also counts if you're 50 blocks above the skeleton.
Build a snipers tower, wait until dark and then snipe away!
gaming.stackexchange.com/users/16851/Squeaky
Just sitting on a 50 meter tall tower and sniping does not trigger the achievement.
You need to be in a "duel", i.e. within the skeleton's vision range to "get its attention" as mentioned above.
Then you can back off (up) to 50 meters and complete the duel.
gaming.stackexchange.com/users/18878/nam rorrim
There is another way.
Build a tower around the skeleton so he can't escape.
Then, count your blocks and by the building, put down 50 blocks like a bridge and go close to the skeleton.
Shoot 3 powerful shots and go to the end of the bridge.
Make sure that your tower looks like a wishing well with no doors, all walls and 1 window without glass pointing towards to bridge.
Now, fire as best as you can until you hit him.
Then he will die and you earn the achievement.
NOTE: if you have 50 blocks stand on the edge right before you fall or make it 51 blocks.
It worked for me, so it is achievable.
gaming.stackexchange.com/users/21653/Cra-z-Boy
All you need to do is spawn a skeleton in a little house with a roof, hit him twice with a diamond sword, back up 50 blocks, then aim up and fire.
It worked for me.
gaming.stackexchange.com/users/33326/vic the belly
50 block sides (squares) =
50 meters in Minecraft.
Try shooting the skeleton on a horizontal axis.
Try going to the limit of where you can still see the skeleton.
Then, raise your bow and fire!
If you don't hit it, try again until it's done.
gaming.stackexchange.com/users/117102/John
The "Sniper Duel" achievement in Minecraft requires me to kill a skeleton from 50 meters away. Is this equivalent to 50 blocks? What is the easiest way to do this? I've recently located a skeleton spawner near my base, how can I use this to my advantage?
How do I get the "Sniper Duel" achievement in Minecraft?
gaming.stackexchange.com
<minecraft-java-edition><achievements>
gaming.stackexchange.com/questions/32195
gaming.stackexchange.com/users/274/Brant
Build a wall/fence/tower around the skeleton. Shoot 3 powerful shots through or hit it with a sword. Several strategies are suggested involving weakening the skeleton and then snipe it from a long distance.
Several strategies are suggested involving weakening the skeleton and then snipe it from a long distance.