Rise of the Kasai

You will learn how to disarm enemies in the second level, Ngari and as such, this is the perfect place to knock out this trophy. Press and select the Hand to enter stealth mode with no weapon equipped. During combat, you must press to grab the weapon from your attacker. You must wait until they actively use their weapon against you so there is timing involved. Plus, the timing window gets smaller and smaller with each successful disarm that you perform. The game mentions that this is intentional so that you use your disarm "wisely."

I highly recommend activating the Invincibility cheat as this will allow you to take your time while going for this trophy. It is definitely not required but it will significantly reduce the skill necessary. The trophy will unlock immediately after disarming your 15th enemy within the same level.