7. Collect 100 Whatevers (It Doesn't Matter What. Just Get 100)
Most games make players collecting something. FPS games have soldiers running around collecting ammo. RPG games usually involve hunting down reagents or pieces of metal to create powerful spells and fantastic armor.
In the good ol' days, platformer games like Super Mario Bros. and Sonic the Hedgehog made collecting items a life-or-death proposition. Mario's obsession with gold coins had nothing to do with concern over his financial portfolio and Sonic's fascination with Beyoncé... Rings meant he could continue to spin and love it.