A minimal, straightforward list:
High-powered blender- essential for breaking down the oats, hemp seeds, and dates into a completely smooth texture. A standard blender will leave the oats slightly gritty; a high-powered blender (Vitamix, Ninja, or similar) pulverizes everything into a genuinely creamy result.
Measuring cups and spoons - for the oats, hemp seeds, peanut butter, flaxseed, and milk.
Tall glass - for serving.
That's the complete equipment list. A good blender does virtually all the work here.