All parts of this set are obtained via briefings and collections:

Legs – Daily planet live briefing

Hand – Metro transit briefing

Back: Survival of the fittest 1 briefing
Survival of the fittest 2 briefing

Chest: Legacy of krypton 1 briefing
Legacy of krypton 2 briefing

Waist – University of Metropolis briefing

Feet – News from around the Planet collection

Items are send to you via e-mail when the briefing/collection is completed :)