There are a total of 6 BLAST Soda Cans available on Halo 2 Anniversary MP maps. It is recommended that you use a Sniper Rifle to destroy them, and they are easily done in Custom Games.
IMPORTANT NOTE: You must play the NEW remastered version of the map and NOT the "Anniversary" version.
[
0:09] - Lockdown
[
0:42] - Zenith
[
1:15] - Stonetown
[
1:54] - Bloodline
[
2:30] - Warlord
[
2:54] - Shrine
GLITCH NOTE: Some achievements in the DLC have been known to have "100% locked" status, meaning you have gotten credit, but the achievement has yet to pop. You will have to wait for it to register. One user has reported only unlocking the achievement by following the cans in the order of the video.