Shantae: Half-Genie Hero
65 Achievements
7-9h
Shinobi Shantae!
Complete the game in Ninja Mode.
1.8%
How to unlock the Shinobi Shantae! achievement in Shantae: Half-Genie Hero - Definitive Guide
What finally did work was un-installing every other piece of DLC except for the costume pack and clearing Ninja mode again with my existing save at the end of the game. It then unlocked when the credits started just like the other modes.
You will need to beat the game in Ninja Mode with Ninja Shantae. Beating Ninja Mode requires precise activation of the teleport feature (which can be frustrating if your controller registers a down press when pressing right). Also, because Ninja Shantae has such a speed advantage, the clear time requirements are much tighter if you’re going for those.
Ninja Shantae moves so fast so in some bosses where you have timed evasion of attacks, such as Wilbur, it's easy to actually run into an attack so keep that in mind. Generally, for all bosses, you can use the teleport to avoid attacks if you find yourself cornered. In the case of Giga Mermaid you can use the teleport to reach her head jewel without climbing.
To beat the game, you must defeat Risky Boots at the end and then escape the final stage via the lava slide, just like in the main game. Risky Boot's attack patterns are identical to the main game. If you can get close to and rapid attack her, you can defeat her not long after the first time she uses her anchor move.