Death Stranding 2 is, conceptually, a game about delivering packages for the betterment of humankind's vestiges. In practice, it's also about sliding boxes onto shelves and receiving little prizes as a thank you—a tranq gun here, new pair of boots there, maybe the odd pair of designer sunglasses. Keep delivering packages to preppers and they'll keep handing out goodies up to a 5-star maximum rating.
In the first Death Stranding, what gear each character unlocked was a mystery until you received it (or looked it up online), but the sequel is surprisingly transparent. The Corpus, DS2's in-game guide, plainly states what gear is left to unlock from each contact. Just open the menu from Sam's Ring terminal, select the Corpus from the left d-pad menu, tab over to "Databank" and find the bio for the character in question.
