The only thing you need for these commands to work is an "addon" called Loop and Halt. The link for the addon is: https://garrysmods.org/download/1102/loopandhaltzip . If you are running Garry's Mod, exit it. Then add the addon to the game and start it again. Now you are able to use the command "loop". Also, when you have achieved the achievement you wanted you can also stop the loop by typing "loop_break" in the console.

Alright, so when you have the addon you are ready to achieve your first achievement featured in this guide.
This achievement is called Doll House and what you need to do is spawn 2000 ragdolls.

Now you might think: "omg, 2k. that'll take so much time man!11!"
But no, with this command it be so much easier and timesaving for you.

So what you need to do is open up a singleplayer world and open your console and type:
loop .01 "gm_spawn models/Zombie/Classic_legs.mdl;undo"

Now when you've got the achievement you want to stop this loop. And you stop it by typing:
loop_break

You need to Create and Destroy 5000 props in order to achieve this achievement.
Alright, so this command will make you get Creator & Destroyer at the same time. If you already have one of these it doesn't make it faster if you remove one part since without creating anything you can not destroy anything and if you only want creator it is still better if you keep the command "undo" since otherwise it will lag as hell for you.

The command is:
loop .01 "gm_spawn models/props_junk/TrafficCone001a.mdl;undo"
but if that command doesn't work use this with a remover toolgun in your hand:
loop .01 "gm_spawn models/props_junk/TrafficCone001a.mdl;+attack;-attack"

(Thanks to QuickNinjaCat for telling me that using "undo" doesn't always work.)

The thing you need to do to achieve this achievement is just to eat, or press the "use" button 200 times.

The command for that is:
loop .1 "gm_spawnsent sent_ball;+use;-use"
If you think that it spawns too slowly you could always decrease the "loop .1" to for an example "loop .01".

What you need to do in order to achieve this achievement is just to kill 1000 animals.

Before you type this command be sure to first select a SMG or any "fast-shooting" weapon in your hand.
The command:
loop .01 "givecurrentammo 9999;npc_create npc_pigeon;+attack;-attack"

What you need to do is just kill 1000 enemies.

I recommend using a RPG so you can kill as many enemies as possible in one shot.

The command:
loop .01 "givecurrentammo 9999;npc_create npc_zombie;+attack;-attack;

This is basically the same command as the one we used in "War Zone" but instead of spawning a zombie we are going to spawn a friendly NPC.

I recommend using a RPG to kill as many NPCs as possible in one shot.

The command:
loop .01 "givecurrentammo 9999;npc_create npc_citizen;+attack;-attack;