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Recommended Requirements
To make the achievements easier to get, I recommend connecting a Gamepad/Controller or doing it with a willing friend online in a custom lobby.

Thanks to LamainPigiama for the following advice:
If you don't have a controller that you can use with your PC, you can use the Steam Link app as one. Having the app on multiple devices = multiple controller.

Currently, 2 player local multiplayer with only keyboards is not possible. Local multiplayer with 2 people limits the number of keyboard players to 1.
Without local multiplayer, achievements are relatively more lengthy and more luck based.

I will refer to the connected controller as afk player in the guide
In the guide I will assume you have a controller connected/afk player/willing friend, if not you can still follow the guide but you will have to follow the instructions in a quick match online.

Thanks to AFAK for contributing maps which make some achievements easier!

Go to Esc > Game options > Weapons (Edit) > Select only 'Others' > Select only 'Black Hole'


Go into any level in local multiplayer and kill all other players by sucking them in the black hole shot by the 'Black Hole' gun.

I would recommend doing these achievements together

• Ace
  
• Royal Ace
  
• Double Kill
  
• Triple Kill
  
• мигающий кинжал (blink dagger)

I recommend doing this with 2 controllers and a keyboard, if you don't have 2 controllers, you can play it online or invite a friend. You can get Ace and the 4 mentioned achievements if you aim for мигающий кинжал (blink dagger) with 3 afk players (local multiplayer controllers/friends).

I would recommend doing these achievements together:

• Explorer
  
• Conqueror
  
• White Death
  
• A poultry meal

This is very straightforward and you would normally unlock this while doing all the achievements.

AFAK has a custom map for this achievement which makes it very easy, you can subscribe here


This one requires a little setup.
Go to Esc > Game options > Weapons (Edit) > Select only 'Rifles' > Select only 'Bouncer'
Go to Esc > Game options > Set HP to 1
Go to Esc > Game options > Maps (Edit) > Select only 'Woods' > Select only 'Woods4'

Now recreate the same setting with the other afk player and shoot. It might require a little adjusting to get the aim right but this is the easiest way I found to do this achievement.

Go to Esc > Game options > Maps (Edit) > Select only 'Laser' > Select only 'Laser8'

Start a match with the afk player and just equip the lightsaber and this achievement should unlock.

I would recommend doing these achievements together

• Ace
  
• Royal Ace
  
• Double Kill
  
• Triple Kill
  
• мигающий кинжал (blink dagger)

Assuming you have any 3 players in local multiplayer/online custom lobby with a combination of controllers and friends willing to do achievements, spawn in a map, make all the players stand nearby and kill them all.

Easy trick is to set HP to 1 in Game options

I would recommend doing these achievements together:

• Explorer
  
• Conqueror
  
• White Death
  
• A poultry meal

Set up a controller and leave it afk, then you can basically just win every round from the start to the very last and you should get both achievements

Get. a. headshot.

Any Winter map should work but I used 'Winter5'
Go to Esc > Game options > Maps (Edit) > Select only 'Winter' > Select only 'Winter5'

Go to the platform your afk player is on and shoot all other platforms. Then jump and shoot the ice platform both of you are standing on. He should fall first and lose and when you win you get the achievement.

Very simple. Just afk other players on the local multiplayer/online custom lobby and keep killing them until you reach 'Wicked Stick' achievement.

I would recommend doing these achievements together

• Ace
  
• Royal Ace
  
• Double Kill
  
• Triple Kill
  
• мигающий кинжал (blink dagger)

Go to Esc > Game options > Weapons (Edit) > Select only 'Melee' > Select only 'Blink Dagger'

This requires 3 players apart from you so I would suggest teaming up with a friend and inviting him to a custom game. You will need to have 3 players using a combination of controllers and players. After you assemble your team just equip the blink dagger and kill 'em all.

Go to Esc > Game options > Set HP to 1
Preferably you can use any weapon but I'd recommend setting options to only spawn AK 47.

Now just shoot with your controller aimed at the KB player and block as you shoot. Might take a couple tries.

Go to Esc > Game options > Set HP to 1
(Can be done on any map but I used Woods3)

This is a tricky one to do online even with a friend because of high ping or latency issues. You can try it but I failed to achieve this one online. I would 100% recommend you connect a controller and do this.

Move the afk player a little farther away and then spam the punch button, it will move the afk player closer to you. This will make it easy to time your block and as soon as you block, punch the afk player and it should die. This may take a few tries.

Go to Esc > Game options > Weapons (Edit) > Select only 'Snake' > Select only 'Launcher'


Snake
Go into a local mulitplayer/online custom lobby and shoot a snake with another player until one targets you and hits you.

Stick Irvin
Shoot a snake with another player until one targets you and then kill the other player.

Just move the afk player off the map >:) and you should get the achievement.

AFAK has a custom map for this achievement which makes it very easy, you can subscribe here

I would recommend doing these achievements together:

• Explorer
  
• Conqueror
  
• White Death
  
• A poultry meal

While doing Explorer/Conqueror, Go to Esc > Game options > Weapons (Edit) > Select only 'Rifles' > Select only 'Sniper'
Then run through all the levels and kill the other player with only the sniper. Some levels assign custom weapons. By the end if you still don't get the achievement, Just set the maps to Wood (easiest with no distractions and hazards) and kill the other player with the Sniper.

Go to Esc > Game options > Set HP to 1

Just jump and click LMB mid air in front of your opponent.

Congratulations on getting all the achievements!

Thank you for referring to this guide :D
If you feel there is an easier way to complete an achievement, or you feel the information provided isn't accurate please comment below and let me know;
and if you enjoyed the guide or found it helpful, please give a thumbs up!

Happy Achievement Hunting!