onsilverwings: I got around to buying this over the holidays and since the original game never had achievements, I didn't know about this one hidden achievement. After some digging on the internet I found out that it's call Hidden Planet. After some more digging, I learned that you get it by naming yourself 'Terminal' and 'Reality as your name and callsign. Just complete the stage and there you go.

Since it wasn't mentioned clearly anywhere and only 2.9% got the achievement, I thought I'd mention it here.