Currently, the achievement Sniper Duel is virtually impossible to get. Under normal circumstances, an arrow will not travel 50 meters. You need to be aiming at a specific angle upwards to get it. And that means that you can't be looking at the skeleton when you fire the arrow.
On a rail.
And people, "Sniper Duel" Isn't really that hard. Try to trap the skeleton somehow, and for the love of god Rise the FOV to anything over 95 while doing it, or else it won't be on the screen!
Definitely have to be "On a Rail", 1000 blocks of railroad track is simply ludicrous. The rest of the achievements are a park in the walk, I usually just trap a skelly and count 50 blocks away for Sniper Duel.
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<Demisedulous>Dude this is Minecraft, can't we all just be autistic together
Iron isn't that hard to obtain, thank god, otherwise On a Rail would be insanely hard. But it still does require 378 pieces of iron to make 1000 pieces of track to obtain the achievement, which is yikes. Aka, 1000 Tracks / 16 per craft = 62.5 crafts rounded up to 63, 63 crafts x 6 iron per craft is 378 pieces of iron.