*This is the area when you actually properly learn about mud camouflage to work and pop the achievement*
Ok once you are in Kuwaq Yaku
and spoken with Abby and the other villagers, you will need to progress up the Stairs into the Temple Ruins opposite where you meet the Merchant
for the first time.
Base Camp Ruins next to Merchant just in front of Temple you need to progress in story to acquire the mud camouflage.
Image after Possible story spoiler below:
You will be promoted to go into a ”Mub patches and press ”
Then Lara will begin to rub sloppy mud all over her which will be her camouflage and help blend into her surroundings.
Now creep upto the wooden pallet as seen in image above and climb through the gap in the fence area, and creep upto the mud wall to blend in which will be in front of you:
You will hear general chatter from the enemies about clearing up the site and be aware of her (Lara I guess).
As soon as this guy with the turquoise top on walks within your reach for a take down, you will be prompted with
tap and Lara will silent take down the enemy.
Then pop achievement unlocked.