Primate Achievement in Halo: The Master Chief Collection

I have a hunch this involves the monkey family in the first mission.

I was thinking the exact same thing! Role on the 11th!!

This is indeed the case. Right after you enter the jungle with all of the Jackal snipers, keep to the left and you will eventually find a family of cavemen behind some rocks. I had to shoot them for the achievement to pop but my friend only had to look at them.

Video Guide Here: https://www.youtube.com/watch?v=P02IofKJ_yE

VIDEO GUIDE (All 3 Easter eggs) http://youtu.be/aJmbkokv1Dk Halo MCC Playlist: http://bit.ly/1xkAfKP

VIDEO GUIDE https://www.youtube.com/watch?v=PgX_Z3exX6I

Halo 3 First Run Guide. All Collectable and missions specific Achievements. Achievements are time stamped in descriptions. https://www.youtube.com/watch?v=0vLLLhht_cE

Here is an achievement guide for "Haplorrhini" "Primate" and "Missing Link" with English Commentary! http://www.youtube.com/watch?v=eP6OZzj4zVw Here is a playlist of achievement guides in HMCC http://www.youtube.com/playlist?list=PL-HeW6XkKdULr5ehVJIQ4dICwEV_0omlB

You DON'T have to start at the beginning! Start at BRAVO rally point (you can use Battle Rifle for all 3! You don't need sniper). And immediately get: "Missing Link: Watching. Waiting. Plotting." Go a little further into the forest with the Jackal snipers and get: "Primate: Halo 3: Find your first missing links." Then at the end of the level you don't have to kill everyone (probably should kill Chieftain so he doesn't kill you), and look across the water to get: "Haplorrhini: Halo 3: Find a lonely missing link." finished in about 6 minutes.

Turn all skulls off. Might just be IWHBYD though. Couldn't get any of the missing link ones then I tried with all skulls off and it popped immediately