BTW, I was ultimately able to satisfy the conditions of this achievement on Hard/Advanced mode, on the latest version, on an iPad. But it took me ~100 runs! And because I refuse to abandon games (because I like keeping my win ratio as high as possible), this took me a very, very long time (and raised my win ratio because it's easy to win with Crystal ships). ~30 of those runs were tainted with the bug that didn't correctly count Rock Pirate ships, but to the best of my knowledge, that bug was fixed. If you're running the latest version, Rock Pirate ships will count towards the total (but non-Rock Pirate ships will not count). But it still took me ~70 runs with the bug fix to do it! I also asked the devs to consider rebalancing this achievement, but I believe they never got to that before moving on and suspending support.
Bottom line:
* Make sure you're running the latest/final version of the game to avoid a bug that doesn't count Rock Pirate ships
* It's easier to get this achievement on Hard with Advanced content disabled, if that works for you
* If you insist on getting the achievement on Hard/Advanced, consider trashing games quickly to get an early LRS + route through many red sectors
* If you insist on getting the achievement on Hard/Advanced without trashing games (like me), be prepared for a very long slog
More info here:
http://www.gamefaqs.com/boards/664216-f ... t/70487471