Halo reach/anniversary 's lost achievements.

Hey,

I heard it’s impossible to get certain achievements through the DLC in reach and anniversary due to the fact that the maps and game types are rare or impossible to get.

Is this true? is there anyway to get these achievements? I’ve play for ages, with no such luck.

There used to be a DLC playlist, but sadly it’s gone…

That sucks. So there’s no way to get them?

Edit: what if I play in a group that had all DLC and hoped for better chance?

All Achievements in Reach are obtainable still, it just takes a while for the maps to show up.