Iron Sky: Invasion

The "Walkyr" (and its upgrade, the Walkyr II) is the most common enemy ship in the game. They aren’t very strong and they don’t have great armor either. They are also relatively slow. They are taken down easily with any weapon that you have, as they have no countermeasures against missiles. Simply take down 300 of them over the course of the game to unlock this trophy.

You can check how many you have destroyed by pressing  and then Statistics. The enemies you have killed will be listed in order from most to least. The Walkyr will usually be top of this list.

All the trophies for destroying X amount of ships can be farmed, however the game creates a save for each individual chapter meaning that when you load a previous save, your stats will reset to what they were when you've completed the chapter. If you follow the Roadmap you will not need to farm any of the kills, the majority will unlock during Chapters 3 & 4.

Remember to check your map with  if you want to actively seek them out.