Gaining 1,000 Paragon levels in Diablo III is no small feat and it's only accomplished by a very few amount of players. But doing it on Hardcore difficulty, where your character's death is permanent, that's some next level insanity. Ukranian player Nokieka is the first in the world to do it.
In the olden days, reaching level 99 in Diablo II was a pretty big challenge, but even though it's easier to level up in Diablo III, getting to paragon level 1000 is just insane. But one dedicated guy, Gabynator, did it way before anyone else.