Cook pasta according to the instructions, drain, and set aside to cook. Once pasta is cooled, pop it in the refrigerator to chill for about 30 minutes.
Slice cucumbers, shallot, and dice scallions. Peel and dice two of the avocados and mash 1 of the avocados.
Combine vegetables and pasta in a large mixing bowl. Season with some salt.
For dressing:
Combine all ingredients for the dressing together, mix well and add it to the pasta mixture.
Mix everything together until completely combined. Serve right away.