Please consider adding in more Halo 2 anniversary map variants with more Environmental Explosives (and maybe reduce the vanilla H2A maps with no explosives on them) to be able to go for the "Rock and Coil Hit Back" achievement right now for all matchmaking playlists (including the upcoming Match Composer feature) a little more easily of a chance. The big problem right now is out of the 10 maps you have (3 are canvas maps also which are NOT in matchmaking), only 3 maps actually have environmental medal based explosives right now or hanging ice to shoot (Lockdown, Stonetown and Remnant) and every map in the playlists really should have explosives or some kind of environment metal based killing object if your going for this achievement since you can only get this achievement online. I am not saying it should make the player any "easier" to go for this achievement, but really once you have killed a few people for the environmental medals, you pretty much have gotten the point of the achievement, thus now the problem is you have to get up to 100 kills for it, which is extremely excessive for 3 maps that only have this chance to go for the achievement on it, 25 kills would have been better. It gets to be really annoying not be able to get maps everytime that has these explosives or Hanging Ice (on Lockdown). The thing about all online achievements in the collection, most do a good job going for them naturally without have to focus on them individually, but this specific achievement is out of balance with those with the few maps that offer it. Please 343 for future Halo games for online achievements, do not make achievements so specific to just a couple maps only to get them on, Bungie did this in past Halo games, and for people like me who like to go for Achievement completion, do not make it a miserable experience to get a certain map online for a specific achievement. I think its bad practice to include such specific type of achievements in the online space like these in the first place. First off, an achievement like this should be general across all Halo games 1-4 (because I think except for Halo 1, they all do have environmental explosives, like fusion coils), not just Halo 2 anniversary only, same with the splatter achievement, that one definitely should have been general across all games in the collection in the first place, since all games have the splatter medal that comes up on them anyway.