How to store/show player choices

I want to show in my game (for Windows/Mac/Linux) how other users have decided at certain points in the game, like in some Telltale games where players can see at the end of a chapter for example that 70% decided to help an NPC.

I'm not sure where to begin. I want to distribute the game on Steam, is there an API or service that allows to collect and show information ingame or would I need to setup my own server to collect these informations?