Prepare the dressing first so the flavors have time to blend. Use a zester or small-holed cheese grater to remove the zest from the lemon. In a small bowl, stir together the Greek yogurt, mayonnaise, garlic, 1 Tbsp of the lemon juice, 1/2 tsp of the lemon zest, salt, dill, and some freshly cracked pepper (about 10-15 cranks of a pepper mill). Refrigerate the dressing until ready to use.
Cook the pasta, in lightly salted water, according to the package directions. Drain the pasta and rinse briefly with cool water to bring the temperature down. Let the pasta drain until it's slightly dry and tacky on the surface.
While the pasta is cooking, slice the cucumber, then cut the slices into quarter rounds. Slice the grape tomatoes in half. Finely dice the red onion. Drain the artichoke hearts, then roughly chop them. Crumble the feta cheese.
Once the pasta is cooled and drained, Place it in a large bowl and combine with the cucumber, tomatoes, red onion, artichoke hearts, feta, and creamy lemon dill dressing. Stir to coat. Serve immediately or refrigerate until ready to eat.