*** This can only be done in the DLC; The Bright Lord ***Shadow Brand is a skill your character will start the game that effectively replaces the shadow strike.
To achieve, simply
HOLD and aim at your target, then
PRESS . You will be transported to your target and the target will be branded automatically. Repeat this action 20 times for the achievement to unlock.
Remember that in this game there is
NO FOCUS; so you will have to be quick to aim and attack! If you are struggling, consider doing it while you have the power of the ring activated as this slows time.