Revenants are extremely slow when looking for players during a hunt, but sprint at insanely fast speeds once they've detected someone. This achievement requires a Revenant to gain direct line-of-sight with a player and start chasing them, without killing them.
By far the easiest way to do this is to use a smudge stick - stand near a reliable hiding spot, draw the attention of the Revenant and before it reaches you, light the smudge stick to blind it and quickly hide again. You'll get the achievement after the contract.