Worship Your Thirst!
From Halopedia, the Halo wiki
Worship Your Thirst! is an achievement in Halo: The Master Chief Collection. It is unlocked by finding and destroying the BLAST soda can on Shrine on Halo 2: Anniversary multiplayer. The achievement is worth 5 Gamerscore and can be unlocked in both matchmaking and custom games, though the latter is much more advisable. It also unlocks the "Shrine" Multiplayer Emblem.
The can is sitting on a structure in the background behind and to the left of red base (when viewed from the center of the map).