Dice the cucumber and chop the olives and fresh dill. Set aside.
In a large bowl, mash the avocado until smooth.
Add the tuna, Greek yogurt, cucumber, olives, dill, lemon juice, and garlic powder.
Mix everything thoroughly until well combined.
Season with salt and pepper to taste.
Serve the No Mayo High Protein Tuna Salad in lettuce wraps, sandwiches, pitas, or over a fresh salad.