No, you don’t get all of them, but you do get 2 of each of these postcards to total 12 for the $20 or more perk. Please add $10 if your mailing address is outside the U.S. Thanks!
Eshcaton-a-Go-Go graphic novel IndieGoGo campaign page, see sidebar for this and many other fine perks.
Source: Eschaton-a-Go-Go IndieGoGo