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 Gamerscore and can be unlocked in both matchmaking and custom games, though the latter is much more advisable. It also unlocks the "Lockdown" Multiplayer Emblem.

Location
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.