Wolfenstein II: The New Colossus

You can get this achievement at a lot of places in the game but the first time it becomes available is after the 2nd level. When you go back into the sub and walk around a bit you will find a weapons upgrade kit. When you find it press and go along to the weapons section, from their you can upgrade any weapon you like and the achievement will pop.

I will leave my video guide below which shows you where to find the first upgrade box.