Isn't It A Pick

There's 9 Isn't It a pick advancements.
They're all obtained from having their respective pickaxes.
Yes, there's two Isn't It Iron Picks when including the Vanilla one.
Yes, a Stone Pickaxe now gives two advancements.

The Isn't it Uranium Boat advancement (not counted here) is obtained differently - from reaching a final Uranium Boat tier.

Isn't It Wooden Pick
Isn't It Purple Stone Pick -- from a Purple Stone Pickaxe
Isn't It Stone Pick
Isn't It Gold Pick
Isn't It Iron Pick -- not to be confused with the one from Vanilla that looks, sounds, acts, smells, and breathes the same.
Isn't It Redstone Pick -- from a Redstone Pickaxe
Isn't It Diamond Pick
Isn't It Emerald Pick -- from a Perfect Emerald Pickaxe.
Isn't It Netherite Pick