DLC achievements unlocking without DLC

Has this happened to anyone else?
I unlocked “Beating Up the Beat” from Castle DLC but do not have the any DLC yet (except Spartan Ops). I was playing a game of Flood, Hivemind, and got the achievement in that.

So, are the other DLC achievements viable without actually having the DLC?

Since most if not all Hivemind maps are on Forge island that is how you got it. For some reason all DLC achievements are obtainable on forge island maps.

hasnt happened to me…

wish it would though seens i paid good money for DLC, and just a few months later NOONE chooses the maps when they pop up!

i can count on one hand how many castle maps matches ive played. soo its ridiculous trying to ‘mop up’ the last few achievements i need

> Since most if not all Hivemind maps are on Forge island that is how you got it. For some reason all DLC achievements are obtainable on forge island maps.

That would be because Forge Island is technically DLC. Seems to only glitch/work with the Castle achievements, though.

Right I see, so Castle’s are doable on Forge Island maps.

That would explain a lot, since I’ve hardly been on them maps.

Cheers for the info folks =)