If the Link above didn't work try this link:
https://youtu.be/TBUu2cKBRxA

Mission 13: Regret
Difficulty: Any (best to do it on easy)
Requirements: Scarab Skull
Recommend: Sputnik and Bandanna Skull's (Increased Physics and Unlimited Ammo)

1. These are the skulls I recommend you use to get this achievement with this method:


3. You will then find yourself here with the text on screen saying "step aside, let the man go through"


3. Use a weapon that fires fast, such as the Covenant Carbine used this video.
Use it on the group outside the door and then the achievement should unlock!

If you want more guides, check out my Steam Guides page

http://gtm.steamproxy.vip/id/Zagcizes/myworkshopfiles/?section=guides

Also subscribe to my YouTube Channel: ZagsTheMan, for more guides, tutorials and gameplay!

http://www.youtube.com/user/ZagsTheMan