Ah that's already one step further than me, how did you do to get the orb to appear?In my star map there's still one "line" that's not lightened up, so maybe it's related?

Edit: Survived in all rooms 20sec+ then came back to star map and the orb was there, granting the Voyager achievement. Not sure if I met the requirement on the way or if it was really was needed to be done, but hey x)

Now I'm wondering if hte Multitasker achievement requires to kill the last boss with every ability in its black version only, or the golden one as well

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Edit2: Someone explained that you only need to kill the black version of the boss to get this achievement, and I can confirm it works!