I did not include the story related achievements and the ''A Full Bag'' achievement as needed to collect every Earth lanturn in the game.
With a map buyable in-game, you can see around where you need to be.

Each map has it's own store, can be located in;


The School.
The Inn.
The Library.


In these you can also buy furniture, needed for the Shopaholic achievement.




Near the end of the game when you've collected 180 Earth lanturns, you can go to the ? map.


In this map you can buy the last few furniture and last 2 outfits.

With this achievement, you will need to go to this map, located in Silent Valley.




Within this map, you will need to shoot down all cursed Earth lanturns before the time runs out.

Outside.

Inside the locked room.

Inside the other locked room.




Inside the Library's locked room.

Inside the Library's hidden room.

Outside, infront of the tower where you need to collect the fragments.

Infront of the entrance to the Sacred Tree Sanctuary.

Inside the teleport room.

On top of the mountain.



Inside the school.

Inside the school 2.

Outside up the stairs near the school.

On top of a bridge.

Inside the teleport room.

Outside near the entrance to the Sacred Tree Sanctuary.



Up the stairs near your ship.

Inside teleport room.

Inside the Inn, behind the counters.

Inside the Inn, take a left, than take the left teleporter.

On top of the building with the vases you need to break.

Same building but a floor below the vases.

I hope i've helped a few with this small guide.
Enjoy collecting! ^^