Question

what do you mean by reign of terror what it's achievement

Answer 1

A period of remorseless repressing or bloodshed in particular Region of terror the during the French Revolution.

Answer 2

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Reign of terror
a period of remorseless repression or bloodshed, in particular Reign of Terror the period of the Terror during the French Revolution.

Achievement
A very simple achievement, which can be gotten shortly after you receive the Guillotine Gun during the second mission "The Book Thief".

It would be hard not to get at least 5 kills on this part, but if you don't, simply restart the checkpoint to try again.

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