I think that Odin with the PG would crush a Celestial.
Odin would know how to properly tap the infinite energy of the PG.
Using IG terms:
"If" this is true, it means that Odin is instantly a manipulator of Time, Space, Mind, Soul and Reality who is more powerful than Arishem.
If Odin didn't already have the ability (shown in past feats) to manipulate and use as weapons, Time, Space, Mind, Soul and Reality, it would be more questionable, as to his chances.
But, Odin knows the game, when it comes to the top of the universal pyramid and if he had the unlimited juice to back him up, there is no reason for him to fail.