I tried to enter a station right as my HP hit 0. I was still able to enter by as soon as I did I got the game over screen, now my save is at that moment and I get game over as soon as I load.
The double axes are bugged, for one of the blades, it will only accept a score of 100% or 0%, so if that one isn't exactly perfect, it will count as 0% for one of the 3 pieces, giving you the 66% for the total.
If you use the "wait for cd" option, and you are doing the quest, the game will wait for your cd before starting the travel of turning in the quest, it shouldn't have to wait for your cd to travel, as whenever you travel otherwise, your cd go down.
You can always finish the game, restart and get the rest of achievements.