A short, focused list:
High-speed blender - essential here. A high-speed blender (Vitamix, Ninja, or similar) breaks down frozen fruit and hemp seeds into a completely smooth texture without leaving gritty bits behind. A standard blender works too, but you may need to blend longer and possibly add a touch more liquid to keep things moving.
Measuring cups - for the milk, yogurt, banana, and berries.
Tablespoon measure - for the hemp seeds.
Tall glass - for serving.
Spoon - for any toppings you add on top, like granola or extra berries.
That covers the complete equipment list. A blender and a glass are genuinely all this recipe requires.