Worlds of Magic: Planar Conquest (UP)

There are two types of game features known as a Gateway and Node. Each is associated with an element type. Both normally hold guardians from the plane of its type. After defeating a Gateway, you will be asked if you wish to travel to that particular plane. Normally defeating a Node just gives you rewards.

There is a discipline named Gate Master that basically turns a Node into a Gateway in terms of being able to transport to the other plane. So upon your "win" you will also be asked if you want to teleport to the other plane. Using a Node in this fashion will not unlock this trophy. You must use an Earth Gateway. The Earth Gateway looks exactly like the trophy image.

You could easily get this trophy through normal gameplay, but if you are solely going for this trophy then I recommend the following:

1. Create a custom Sorcerer Lord.
2. Select the Cartographer, Planar Cartographer and Omniscient disciplines. Omniscient allows you to see everything on the map so it just makes this faster to see your target.
3. Select two planes with one being Earth.
4. Increase Features to Countless.
5. Start the new game.
6. Hopefully you started on the plane that is not the Earth plane. If you did start on the Earth plane then restart the game until you are on the opposite plane.
7. Build up a large enough army to defeat the guardians of the Earth Gateway. Head straight for them when you are ready for battle.
8. After you win the game will ask if you wish to transport. Say Yes and you will move to the Earth plane whereby the trophy should immediately unlock.