maybe someone can help me?
I have opened that Achievements tab yesterday and I saw i have mostly like 1% or planetary "achievements" (whatever it means).
Point is that I have explored them ALL to the furthest corner and opened all maps.
Why this counts a 1 %??
I don't think planetary exploration was recorded in the Codex, meaning that the system didn't necessarily track the fact that you had explored the planets. So, you have to start from square one (just like kills, etc, that weren't tracked prior to the implementation of Achievements). Now, you'd think they could have found a way to include your past explorations since your character file obviously contains that information (since you can log in and out and all explored portions of maps remain explored).