Hey NightmareNear, I’m not sure if you have found an answer to this yet but there are not unique achievements tied to Ammo Baron or the Dual Barons in Ninja mode. The Costume Pack modes (Ninja, Officer, and Beach) have progression based achievements split up across the three bonus modes.
So, for this case, the Ammo Baron achievement is part of Beach mode and the Dual Barons achievement is part of Officer mode.
Hope that helps!
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