I've been trying to get the H3 MM achievements, and they all seem pretty straightforward. There's just one problem. A lot of them are map/gametpye-specific.
Defend This - Get 1 flag kills on any Legendary Map.
Flag Dropped - Get 2 flag-carrier kills on any Legendary Map.
Road Rage - Get 5 Warthog chain-gun kills on any Legendary Map.
Look Both Ways - Get a Splatter Spree on any Legendary Map.
Hammer Time - Get 5 Hammer kills on Assembly.
Ghost Patrol - On Longshore, get 3 Ghost kills.
Post Mortem - Get 2 Kill From The Grave medals on Orbital.
Get The Horns - Get a bulltrue on a Mythic map.
Delicious Brains - On a Mythic map, infect 2 humans.
Zombie Repeller - On a Mythic map, kill 2 zombies.
Now I have the Mythic disc, with all maps, but Legendary/Mythic maps never get chosen! I've never even played on Orbital, Assembly, or Longshore! And on the very rare occasion that a Mythic/Legendary map does get chosen, its not the right gametype! I've only played CTF 3 or 4 times, and I've never played one game of Infection.
Bungie really screwed up by making these so hard to get. You need 3 things to happen to get them.
1. Get the right map.
2. Get the right gametype.
3. Do what it says.
And don't tell me, "just keep playing, they'll show up". Because sometimes I put Reach away and play a full week of H3, and I still don't get to play the correct maps/gametypes.
Update: Last night, I got CTF on Avalanche, but it got vetoed! :wallbash: