Go Viral! Achievement
Have a successful Viral Advertising campaign.
This achievement requires that you deploy a viral advertising campaign for your zoo. Advertising is used to increase the amount of guests in your zoo for a period of time and can be found by selecting the Main Gate to enter the Edit Menu. From here, select Advertising and then Viral. Choose any intensity that wish and the achievement will unlock immediately. Note that Viral Advertising will not become available until you reach Fame Rating 20 and you also must research before using it.