Hades: Guide to unlocking the hidden weapon aspects

If you just want the bare minimum information without watching a video, here's the best explanation I've found on the internet:

[papaboris]

Minor correction/clarification: You do NOT need to have the spear equipped for Achilles to give you the code phrase. The ONLY time your weapon matters is when talking to the bull about the fists, and even then, only the first time.

[kaboom____]

Hey man! How's going? so, i unlocked all of the weapons, and talked to skelly, but the interact button didn't appear. Do i need to finish the game first or is it maybe a bug?
Thanks in advance

[alexmartin]

I'm playing this game and this is so helpful

[SavovicIlija]

Im like in 50run and no dialog, also he started not showing always, and not giving any dialogue at all? :(
EDIT: run after i wrote this i got dialogue LMAO