Kill 20 enemies with the Grappling Hook
Call of Duty: Advanced Warfare PARTY CRASHER – Achievement / Trophy Guide
The 20 Grappling Hook kills have to be done in the stealth section in the beginning of the mission. You also have to stay undetected during this part or the mission will fail.
The best way to do this is to stay hidden in bushes. The small rooftops around the map are also a good way to get some kills. If you stay crouched up there enemies and drones shouldn’t be able to spot you. Take your time and use whistling by pressing right on the d-pad if enemies are too far away. There are more than 20 enemies around so you don’t have to take out all of them.