To unlock the Treacherous Architecture trophy in Hitman 3, you’ll need to kill Charles Ingram with his oil-rig model, push Marcus Stuyvesant over a rail, and kill them both in the air. This is a fairly straightforward trophy that can be unlocked in two playthroughs of the On Top of the World mission in Dubai.
First, follow the (In)Security Mission Story. If you're playing on Casual or Professional, you can highlight the story from the menu and see where you have to go first. You’ll need to access a staff room to get the ball rolling on the Mission Story.
Starting from the lobby, head up the stairs and to the left and up another set of stairs past the camel statues to a bar. Go to the far left corner of the room and run up the stairs with the blue drapes.There will be two guards. Eliminate one, hide the body in the closet, and put on his uniform.
Go past the staircase you used to come up and immediately turn right into the security room. You’ll hear two guards talking about a new security guy starting today for Marcus Stuyvesant.
After that, head out the double doors in front of you, turn left through another set of doors and down a set of stairs through the kitchen and into the changing room. You’ll hear the new recruit talking to another staff member. Sneak behind them and pick up his transfer papers located on the bench. You’ll then need to head back the way you came and up to the security office.
Once you present the papers to the security guard, Marcus will come down to the office to greet you, take your papers, and welcome you into his personal ranks. Marcus then takes you on a walk to the balcony where you have to complete a knife-throwing mini-game to impress him. It’s not hard, simply aim at the targets and lob the knives. If you hit them all, Marcus dismisses his other guard and conveniently stands next to an incomplete part of the balcony. Give him a nudge to complete this part of the trophy.
Next, we’re going to impale Carl Ingram on his oil rig model. To do this, we’ll be following part of the Bird of Prey Mission Story. You’ll also need coins or something you can throw to cause a distraction in your inventory.
Turn around back the way you came and take the first set of doors on your right. Head through the backstage area back out into the atrium. You’ll see Zana Kazem, the man in the funky suit, arguing with a staff member.
Once he’s finished, follow him into the smoking area and turn right into a small alcove area with a bench, a sound system to interact with, and bushes to hide in. Turn on the sound system to get Kazem to investigate the noise, then hide in the bush. Once he comes over and turns off the distraction, take him out, put on his clothes, and hide the body in the bushes. You’ll also want to dump any weapons in these bushes too to pass the pat-down. Head towards the stairs where Kazem and the staff member were arguing to get frisked. Then go up the stairs and talk to the assistant. You’ll then be walked up to a meeting with Ingram who asks you to deal with a pesky journalist who’s asking too many questions in the atrium.
Head downstairs, and you’ll see him in a red blazer. Approach the journalist and ask him to accompany you somewhere private. I took him into the atrium toilets and choked him out in a cubicle there, but any secluded place where his body won’t be found will work. Get a photo of the incapacitated journo and head upstairs to Ingram’s assistant once again who will lead you up to Ingram’s penthouse room. Once in the bedroom present Ingram with the photo and he’ll clear the room of security bar one guard. Ingram will go over to his desk and stand over the model. However, you’ll need to distract the one remaining guard before killing him.
Take cover behind the bed, and flick a coin (or another throwable item) through the doorway into the adjoining room next to the guard. He’ll go in for a look. Wait for Ingram to turn around over the top of the model and push him down onto it before making a very swift exit out of the penthouse and to an escape route ending the level.
The next part of the trophy requires you to kill both targets while they’re skydiving. Start the mission again and head straight to the Bird of Prey Mission Story again with Nazem. Repeat the process of taking his clothes and going up to the meeting room. Instead of listening to Ingram, go out of the double doors on the left-hand side of the meeting room.
You’ll be standing in front of a security room. Turn right, and you’ll hear a guard talking on the phone about an evacuation drill planned for the next day. He mentions that a keycard to activate the alarm is in a safe in the office. The code for the safe is 6927. Take out that guard, disguise yourself with his clothes, and dump his body over the railing (it won’t kill him) but not the railing over the stairs. Head into the office, and you’ll see the safe on your right. Enter the code: 6927 and grab the key.
You can also unlock a second trophy later by grabbing the banana off the desk next to the sleeping guard in the office. Walk past the sleeping guard and out of the office, and you’ll see a blue carpet that leads up to the penthouse. Follow that path into the penthouse, and you’ll hear two guards talking about the lockdown/evacuation drill.
There’s a card reader located next to two parachutes and another upstairs. To activate the drill, you’ll need to swipe your card in that reader and rush upstairs to the second reader and swipe that one, but first, go through the archway ahead of you, cross the hall, and into the kitchen. Grab the knife off the counter. Head back to the parachutes, and once the guards have left, open their cases and slash them with the knife.
Now, if you picked up the banana from earlier, you might be able to unlock the Keep Your Eyes Peeled trophy here. Get the banana and place it in front of the parachute on the right, but not too close to the wall. If all goes well, you’ll see one of the targets slip on the fruit when they go to collect the parachute.
Next, swipe the card through the reader and run through the arch, across the hallway and turn left up a flight of stairs. Turn left into another room, and you should see the second card reader directly in front of you.
Go ahead and swipe it to start the evacuation procedure. Both targets will head towards the helipad. Ignore Grey’s instructions to go there; the helicopter doesn’t take off. At this point, I ran and hid in the basket next to the two parachutes to see who would slip over on my banana. You can do the same, or just stay out of the way of the enforcers who will see through your disguise.
The targets will pick up the sabotaged parachutes and jump off the building to their deaths. The trophy should pop (and hopefully that extra fruit-related one too). Finally, exit the level.
Alternatively, if Keep your Eyes Peeled didn't unlock, you can try placing the banana in the spot where the two targets jump from. Sometimes the guards escorting the targets get in the way and slip on the banana themselves, so it might not work.