To get this you need to recruit two Environmentalists, with religion points. Then, having the right Civic Technology, create two national parks in both the Crater Lake and the Yosemite World Wonders. Yes, the achievement line is kinda misleading, you can have two national parks.. the problem here is to find a map that has both Wonders in it. There are several ways to get the map, including using a map editor, external saves, mods, console commands, etc. but I found them all.. too complicated.. The one I like is to create a Large or Huge map in the Information Era, quicksave on the first turn, found a city then delete all units. Create a spaceport and then go for the Earth Satellite. Skip Turns until its done then look around the map for the wonders you need. If you found them, great! Reload the quicksave and start building. Just so you know, you dont have to claim them in the same turn.

Map Seed: -51290197

Wet
Sea Level Low
Continents
Large
Teddy vs Cleopatra