You’ll find this ability in the Dual-Wielded Lightsaber Skill Tree - once acquired, you’ll be able to hold down Y when using this Stance to have Cal put the lightsaber in front of him using the Force. Keep the button held until the moment an enemy attacks you, then let go. If you get the timing right, Cal will hit back with an automatic counterattack, denoting that you’ve successfully executed a precision release. Do this ten times to unlock the achievement.