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Firstly

You need to build an arena (your choice of size) . I went with a small one as my GPU cannot handle so many rendering of objects. You dont need openings as you can noclip spawn kill with this method.
You just need to build it to hold the subjects in their 'Prison'.
I suggest using Fence02a as it has a concrete base and can stand upright when spawned.
You can find Fence02a by 'Q' > 'Your Spawnlists' > 'Construction Props' > third row, third column





Then, you need to use your Physics Gun to freeze the fences so that they do not 'fly out' when you detonate the dynamite. In order to freeze it, aim the Physics Gun at the fence and right click on it.
Once you're done with your arena, it should look somewhat like this:





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Secondly

You need to add your dynamite.
You can find dynamite by 'Q' > on the search bar for 'dynamite' > click the tool box image
Click it and it will automatically let your creator device (Tool) to spawn as many as you wish.




Once you're done, it should look like this:




Remember to NOT click "Remove on explode" for the dynamite or else you'll need to redo the dynamite part again. Also, you'll need to set your explode button. You can click on the explode option and press the key you want to bind it to. You don't need to do this again after you've set a bind key.
I've bind it to 'G' as it was free. Afterwards, you'll need to remember to freeze each and every dynamite to the position or else when it explodes, it will 'fly under the fences' and make a whole mess.




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Thirdly,
You'll need your subjects
IN ORDER TO GET THE ACHIEVEMENT "War Zone", you'll need to spawn kill 1000 zombies

You can find the zombies in 'Q' > 'NPCs' > 'Zombies + Enemy Aliens' > choose your preferred ones
I went with zombie. Right click on your preferred enemy and 'Spawn using tool gun'








Now, you can spam zombies/ aliens in their 'Prison'.
Once you're done, you can press your binded key for explode. It should look like this:






IN ORDER TO GET THE ACHIEVEMENT "Bad Friend", you'll need to spawn kill 1000 NPC that are under the 'human + resistance'.
Repeat the same steps and you'll get the achievement.





IN ORDER TO GET THE ACHIEVEMENT "Innocent Bystander", you'll need to spawn kill 1000 animals under the animal folder.



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Fourth,
IN ORDER TO GET THE ACHIEVEMENT "Destroyer" , you'll need to remove 5000 things and this is where you'll find the corpse of the subjects useful.
You'll need to find the tool to remove the objects. In order to remove the corpses easily and stress free, you'll need to find your removal tool.
You can find it "Q" > search bar > "remover" > click on the tool box and your creator tool changes into a removal tool.



And now, just use your remover tool gun and aim it on the corpses and left click it. The corpse should disappear, leaving what seems to me a trace of rice and after a second or two, it disappears as well.
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By now,
You should have gotten the achievements
"War Zone" ---- spawn kill 1000 zombies/ aliens
"Bad Friend" ----- spawn kill 1000 friendly NPCs
"Innocent Bystander" ---- spawn kill 1000 animals
"Destroyer" ---- remove 5000 things
"Half Marathon" ---- depends on how long it look you to get the previous 4 achievements above. (4h hours to get it. )

Added bonuses :
IN ORDER TO GET THE ACHIEVEMENT "Secret Phrase" ------ Go to your game and press 'Y' for talking and type in 'bloxwich' into it and get the achievement.


IN ORDER TO GET THE ACHIEVEMENT "Ball Eater" ---- eat 200 balls.
'Q' > 'Entities' > 'Fun + Games' > right click on the coloured balls and ' spawn using tool gun'
Press 'E' on the ball to consume it. You can spam the left click on the tool gun while spamming 'E' on the same time. (Very fast : 1 minute)



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