If you are looking for the trophy or achievement in Fallout 4 called The Harder They Fall, you will only need to kill five Behemoths or Mirelurks, which are considered big or giant creatures. Some players have had a tough time attempting to accomplish this feat but there is a video guide showing where the giants are and how to defeat them.
If you want to get this achievement, The Harder They Fall, you might have some problems since these giant creatures can one hit kill you. Although you can pretty much create your very own weapons, it is advised that you take a Mini-Nuke Launcher or Rocket Launcher to rid the behemoths quicker.
When battling them, they might look big and slow but these things can cover ground quickly, and when they reach you, there is little one can do to prepare for the worst when these things attack. So it’s best to bring your power armor when picking a bone with these giants.
Although there are some videos that show battles with these giants with no power armor equipped, be safe and equip the suit anyways. Another thing worth noting, do not bring a companion with you since the giants might kill it, making it not count. And since rare enemies like them do not respawn, its best to make your first encounter their last encounter with you.
In addition to this, Gametastik made a video showing five locations of where behemoths and a Mirelurk Queen are located, and his best way to kill them. However, he runs this video with Dogmeat and no power armor, so if you want to take his approach you best be well prepared.
If you missed the location of the giants, and you want The Harder They Fall achievement, you can check out this list below that tells their locations:
And that’s how you get the trophy or achievement The Harder They Fall in Fallout 4.