for the nick thing, do you mean insert code_glitch on line 1 or [your nick]?

also, I think achievements are best left in english personally because that way, its a bit more original and keeps its context... although the descriptions could change no problem. Even if you dont want to keep them the same, i know how you feel since it is your game and you may feel it is incomplete with some parts in english.

cheers,
code_glitch