Bring a pot of salted water to a boil and cook the rotini pasta according to package directions until al dente.
Season the chicken breast evenly with sea salt, black pepper, and garlic powder.
Grill the chicken over medium-high heat for 6 minutes per side until the internal temperature reaches 165 degrees.
While the chicken and pasta cool slightly, dice the cucumber into half-moons and finely chop the dill pickles.
In a small bowl, whisk together the Greek yogurt, Dijon mustard, lemon juice, and dried dill to create the dressing.
Slice the grilled chicken into bite-sized strips and combine them in a large bowl with the pasta, cucumber, and pickles.
Pour the yogurt dressing over the salad and toss thoroughly until every ingredient is evenly coated.