From Halopedia, the Halo wiki

Knowledgable is an achievement in Halo: The Master Chief Collection. It is awarded for activating the tenth Halo 2: Anniversary Terminal on Gravemind. The achievement is worth 5 Gamerscore and can be unlocked on any difficulty.


The terminal is in the first Valley of Tears. At the top of the cliff on the far side of the valley, past the exit door, on the wall behind where a Kig-Yar Sniper spawns, it can be found on the wall.


The name of the achievement misspells the word "knowledgeable".