Thirst Locked Down!
Thirst Locked Down! is an achievement in Halo: The Master Chief Collection. It is unlocked by finding and destroying the BLAST soda can on Lockdown on Halo 2: Anniversary multiplayer. The achievement is worth 5 gamerpoints and can be unlocked in both matchmaking and custom games, though the latter is much more advisable.
The can is found sitting on a ledge behind the ice stalactite in the center of the map. Simply shoot down the stalactite to access the can.