From Halopedia, the Halo wiki
Enamored is an achievement in Halo: The Master Chief Collection. It is awarded for activating the seventh Halo 2: Anniversary Terminal on Regret. The achievement is worth 5 Gamerscore and can be unlocked on any difficulty.
The terminal is found in the large room in which the player encounters Kig-Yar Snipers, Yanme'e, Sangheili Honor Guardsmen, and a pair of Mgalekgolo. The terminal is on the upper level, on the pillar behind Regret's hologram.