Bring a large pot of well salted water to a boil. Add the fettuccine to the pot and cook according to directions, about 7 minutes.
In a medium bowl, gently combine all ingredients, but set aside half the avocado. When ready, use tongs or pasta spoon to lift cooked fettuccine directly from pot to the avocado mix and gently coat pasta with mix. Plate and top with remainder of cubed avocado.