So, with the addition of the Anniversary maps to Reach, a handful of achievements tied to the Defiant Map Pack were added in along with Anniversary achievements. These achievements, unlike the first wave of Defiant achievements, require you to be on a Defiant map to complete, and as Reach's DLC matchmaking is still incredibly flawed, the likelihood of you finding a match on a Defiant map and then completing the achievements is very unlikely. The now-lack of a DLC-centric playlist makes the chances of getting these achievements even less likely. So as someone who would like to have an S-rank in Reach, I'm reduced to having to boost.
I'm hoping there are enough duders on here who still play Reach pretty consistently, also have the Defiant maps, and are in need of getting these achievements. If you are, chime in and let's try to get a posse together to grab these elusive achievements.
Gamertag is Captain Felafel.