From Halopedia, the Halo wiki
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BLASTacular! is an achievement in the Halo: The Master Chief Collection. It is unlocked by finding and destroying all BLAST soda cans found on the original six Halo 2: Anniversary multiplayer maps. Although a seventh Blast can is found on Remnant, it is not required for this achievement. The achievement is worth 10 Gamerscore and can be unlocked in both matchmaking and custom games, though the latter is much more advisable. It also unlocks the "Blast Can" Multiplayer Emblem.