Hello Everybody
This Guide will outline the Best Way to get the "Schockhammer Clip Upgrade" Achievement/Perk.
Even though the Name of the Weapon suggests that it´s some kind of Railgun (which would have been Awesome), it´s actually a Shotgun, very similiar to the one in Wolfenstein: The New Order. For this Achievement you need to kill 50 Enemies with the Schockhammer.
The Gun can first be found in Chapter 2 "The Docks".
From the Beginning of the Level you want to kill all Enemies and then make your Way to the Right Side of the Starting Area where you can find a Lever. Pull it and a Big Metal Door will open right in front of you. Swim over to it and follow the Path to a Wall you can climb with your Pipes.
At the Top you will see 2 Enemies, one Regular Soldier and a Heavy Soldier carrying the Schockhammer, Kill the Heavy Soldier, grab the Schockhammer and start shooting. There will also be another Heavy Soldier who you can get some more Ammo from in the Same Room.
After you killed everyone you can reload the Checkpoint and you will restart at the Bottom of the Wall you can climb with your Pipes. After a few Restarts you will have this Achievement/Perk.
Gute Jagd!