Saturday Morning Cartoon
From Halopedia, the Halo wiki
Saturday Morning Cartoon is an achievement in Halo: The Master Chief Collection. This achievement is obtained by finding and looking at the box of Web-O's in Mombasa Streets.
Method
Start and proceed through the level as usual until Superintendent grants access to the VISR database. In order to go from the beginning of the level to Dare’s helmet (the beacon to begin Tayari Plaza), players need to enter a building, cut through a courtyard occupied by Grunts, and enter the building overlooking Tayari Plaza.
After entering the first building, search the floor surrounding the door leading to the first courtyard. To the right of the door and in front of a couch, a box of cereal labeled, Web-O's, can be found. The mascot on the front of the box is a picture of a gorilla with a cowboy hat.
The achievement would be awarded upon centering the view on the box.
Trivia
The name of the achievement alludes to the character on the box, which is recognized by Bungie employees and Bungie.net members as "The Webmaster" (one of Bungie's many inside jokes).