This Seeking Tech tutorial will show you how to get the Just Because trophy and achievement.
For this to unlock, you need to “blow up an armory or provisions storehouse with TNT.”
These are small rooms that contain a lot of food, ammo, weapons and items.
The first opportunity to earn this trophy is at the Bolshaya Past Base at the top right corner. In the shack there, you will find some TNT.
Once you get some TNT, place it inside the small shack and then move away at a safe distance. You can then detonate the bomb to unlock this trophy and achievement.
If you need more help, then you can check out the video walkthrough below: