Fallout: New Vegas

I am writing 2 solutions here 1 with and 1 without spoilers

1st no spoilers.

Again this is story and all you need to do is complete some quest that are given to you. All of them have markers on you map to follow and your pip boy has details on what to do.

**He will ask you what you want to do tell him you need to think about it and then make a save file. This is where you choose to evacuate or fight. These 2 options are for the last 2 achievements you should need.
O Daughter of Babylon - Crush the White Legs.
May my Hand Forget its Skill - Evacuate Zion.

2nd *SPOILERS*

To do this you must complete the following quests :
The grand staircase
The advance scouts
The treacherous road
River monsters
You don't have to do them in this order but i did and so thats how i am writing the solution. These are all given to you by Daniel after the turning in the last quest.

The grand stair case.
As you start the leave the camp Waking cloud will come and speak to you. Get her to follow you she will help kill things. She will then tell you to speak to the Shaman. This will give you a new quest Rite of passage.

Leave the grand stair case for now and start rite of passage. Head back into the camp and into the shamans cave, He will ask you to go and collect 3 sacred datura roots. Head off to get these. They are all marked on your map so follow the markers and pick them all up. Once you have all 3 head back to the cave. The shaman will make you some tea and tell you to go and retrieve the paw from the ghost of she.

The ghost of she is a giant burning yao gai. The ghost is marked on your map. Head there and kill the ghost and collect the paw. The ghost is quite easy to kill will a laser rifle. Quick travel back to the shaman cave and speak to him. Thats the quest complete now back to the grand stair case.

Follow the marker on your compass and you will find the map and the quest will be complete.

Now for the advance scouts. Follow the markers on your compass to Bighorn buff. You will find some White leg camps. Kill them all and take the 2 war totems from the first 2 camps you come to. Quest complete.

Now the treacherous road. Follow the markers on your compass to find a bridge. There are a lot of bear traps here so be careful. All of them are markers on your compass. Disarm all of them and kill the white leg and their dog on the bridge. Once you have disarmed them all the quest is complete.

Now for river monsters. If you have found the Yao gai cave already fast travel there if not start walking. Once there go inside and there will be 3 markers on the compass to follow. Each of these are places to plant the dynamite. Head to each one and place a charge. The place to put them is on the floor and there will be a light grey marker that looks like the charge in the spot you should put them. Just walk up to them and press A. Once all 3 are set leave the cave. Equip the mining detonator and blow it up. Quest complete.

You will now have a new quest pop up in your pip boy - Gathering storms. First thing to do is quick travel back to the camp to speak to Daniel. Once you speak to him your achievement will pop.

**He will ask you what you want to do tell him you need to think about it and then make a save file. This is where you choose to evacuate or fight. These 2 options are for the last 2 achievements you should need.
O Daughter of Babylon - Crush the White Legs.
May my Hand Forget its Skill - Evacuate Zion.