No. Too many conflicting ideals, too much greed.
That doesn't mean we shouldn't try to get along better, though.

It is achievable, yet not likely, given prophecy.

No. Too many takers

Entire peace is not possible as far I can see. however, it can be sustain at some reasonable level though.

Only the dead know the end of war

World peace never will be achievable because there will be always humans on earth who can't accept and tolerate each other because of different race, opinion, nationality or religion.

Probably not.

100% No

it's entirely achievable, with the swift application of the worlds nuclear arsenal the world would be quite peaceful afterwards

Define world peace.