Story Related, Cannot be missed.
Once you've completed the slaughterhouse and bought the second flight stabiliser, you will need to buy the space engine. This costs 30 pearls at the Mammago Garage (Furthest room back.). If you don't have 30 pearls, there is a total of 14 up for grabs in the Volcano on top of Black Isle that can only be accessed when you have Beluga with two flight stabilisers. Once you have the space engine, fly the Beluga as high as you can then press B when prompted to. Now, head directly for the moon (Shoot the iced animal if you still need pictures!) and the achievement should pop up when you reach it.