In this guide, you will learn how to get the Judgment Day achievement/trophy for killing Harriet with poisonous gas. All of the achievements and trophies in this game have really cool names and references.
The first step is going to Carl’s Bay in the morning to take out Harriet for the first time. It is an important step because taking her out for the first time will grant you access to her weapon which you unlock at the end of the mission. Then you can take this weapon into the mission again and unlock the achievement or trophy.
It’s up to you how you want to approach this. You can get a silenced weapon and shift your way there sneakily making sure nobody sees you or you can just run in guns blazing and then take out Harriet.
But either way, you’ll have to do it, so do it and then complete the mission.
On the mission rewards screen, you will notice that you have unlocked the gear. At this point, you need to make sure you leave the district infuse the four-pounder and then return to Carl’s Bay the next morning.
You need to choose Karnesis as your shift. It’s going to help you quite a bit and you can choose the four-pounder as a weapon as it does a toxic Haze effect that gasses the enemy on impact.
Once you’re ready, you need to load into the mission, then make your way over to Harriet and try to be stealthy if you can. It will make her location kind of more permanent and then you won’t have to worry about other enemies shooting you and everything. You can just slowly work your way towards her.
There’s kind of a very specific way you are going to attack her. Once you’re in this room with her alone, you need to bring out that toxic weapon, the four-pounder and start by shooting her in the chest four times.
Then you need to shoot the ground to cause poison gas near her that will damage her but then use the karnesis ability to keep knocking her down.
It is because if she shoots at you and it goes into the gas it can explode and kill her and then it will kind of void the achievement. It is the optimal way to do this if you follow these instructions exactly.
She will die pretty quickly unlocking the Judgment Day achievement/trophy.