HITMAN World of Assassination

This will take two playthroughs as you can combine shooting Alex from the roof and putting her to rest. You will need to unlock and bring a sniper with you through level mastery or by carrying progress over from Hitman 1 and Hitman 2. First, head to the graveyard and use your hitman vision to find and shoot the 3 bird nests in the area. Then make your way through the house to the roof above Alexa's office. Wait for Alexa to walk through the graveyard and then stand in front of her grave before taking the shot with the sniper rifle. Second, you will need to start in the Staff Room with a lockpick. Rush upstairs into the bedroom with the cane and then head up to Alexa's office. Instead of going inside, walk to the end of the hall to find a secret switch that you can use with the cane to access Alexa's secret room. Then simply kill her, if you are too slow and she has left the room you will need to restart.

Upstairs, Downstairs guide

Requirements

Rooftop kill : LEVEL 20 MASTERY + Shortcut on Zachary's Balcony unlocked
Private room kill: None
Put her to rest : None

1. Rooftop Kill.

For the first part of this achievement you are going to need to have a sniper rifle unlocked. For this mission you have to be level 20 BUT you can use any other sniper you have unlocked in other maps.

Start the game at the starting location the only thing you will need is a brief case and your sniper. Jump the wall to the right at the start, run across the water and take a left. You need to make your way over to the cemetery area of the map. sneak along side the two gardeners working on the broken down lawn mover. go past them and take a right.

You need to wait for the undertaker to look through the gap and move away go knock out the gardener and hide his body. Shoot the three birds nest in the trees above you. Now its time to race! you have to make it to the roof of the building before Alexa starts her inspection of the grave site. Do not worry you will have plenty of time.

Run to the left of the grave sit and head over to the left side of the mansion. continue moving along the left side of the mansion you will NEED to knock out a staff member who is smoking. Hit him with the case and keep running forward (The body may be seen DON'T worry)

Turn to the right and prepare to climb the previously unlocked shortcut MAKE SURE you take out your gun first. Climb the ladder subdue the guard. Place your rifle on your back also. The guards will make you however some staff will not. Exit Zachary's room killing the two guards outside and the one walking the hall.

Once you have killed them run upstairs killing the guard on the stairs as well as the one at the other end of the hall. Move forward into Alexa's office you will see a guard to the left kill him and walk up the stairs. Halfway up is a ledge you need to jump onto it and start moving left towards a window. when you can climb through the window this is the rooftop where you need to shoot Alexa from.

Its up to you when you kill her however you can complete 2/3 the three tasks is you time it right and shoot her into the grave as shown in the video. Be care through she only will die if its a headshot otherwise you need to hit her twice.

2. Grave kill.

Just in case you didn't shoot her into the grave lets talk about how we can kill her easy. Start the game in the garden and make your way over to cemetery. This should not be an issue as we need to be a high level to unlock the sniper rifle.

Once you make it over to the graveyard Subdue the gardener as well as subdue the undertaker. Now we need to undertakers clothes and hide the gardener and the now naked undertaker in the box just to the right off the grave sight.

Turn around and shoot the three birds nests in the trees just like you did in the previous tutorial. don't be alarmed if people come investigate the gunshots just sneak past and be careful your not seen. make your way over to the maid who is outside the grave yard she will telephone Alexa to come down.

Simply wait for Alexa to come down she will start walking around the site that has been prepared. wait by the grave she will eventually come to look at it. Conveniently the guard will turn his back and you can push her into the empty grave unnoticed.

3. Private room

The fastest way i have found to kill Alexa in her private room requires you to start Zachary's room as the inspector. Run out the room and head up the stairs. You don't have permission to be on this floor, Wait for Alexa to go into her office before you make your move.

Waiting on the stairs as soon as she enters shoot the guard on the stairs fast so he cant call out. You will need to act fast as another guard across the hall will see you so you need to walk up and kill him also.

I then went on to kill the two female maids and subdue and take the clothes of the servant. This outfit will get us access into the reception room. Walk into the room and wait for Alexa to go into her private room.

Now we have 2 options kill the guards and then storm the private room. The problem i encountered when i tried this was that Alexa would leave the room and run. So we go all RAMBO and just storm the building straight into the private room and gun Alexa down. This will cause the guards to open fire but Alexa will be dead and you will have completed the mission so it doesn't matter we have completed our goal.