I've came to the concept of creating a local server for getting achievements via it after many unsuccessful attempts to create an open public server. It didn’t work out for me and the players who helped me get achievements. The server was created, but no one except its creator could see it. I was able to find a solution in VPN. To do this, we need the server itself and a program for creating virtual private networks. I used RadminVPN.

1. Installation
   Go to the Steam library. Install Blade Symphony Dedicated Server. To do this, you need to enable the display of Tools in your library. The server will be installed in the game folder.
   
   
   
   
2. Server's setup
   In the directory ".....\Steam\steamapps\common\Blade Symphony\berimbau\cfg\" in the file "server.cfg" (open via notepad) you can edit the parameters you want, such as server name, password, round duration and others.
   
   
3. Starting the server
   • DO NOT START THE SERVER VIA THE BUTTON IN THE STEAM MENU.
     Because of this, when you log into the server you will get the error "Steam Validation Rejected"
     To avoid this, you need to start the server via the Command Line with additional parameters.
     The server .exe file is located in the directory "....\Steam\steamapps\common\Blade Symphony\bin\win64" called srcds.exe. You can't open it directly. The "Bad Boy" error will appear (trolling from the developers), stating that it needs to be opened via the console.
     
   • To run srcds.exe via the command line (CMD), enter the full path to the file in it. And be sure to add the first server map parameter. Otherwise the server will not start. My entire command looked like this:
     

     "D:\Program Files (x86)\Steam\steamapps\common\Blade Symphony\bin\win64\srcds.exe" -console +map duel_winter

   
   
4. Setting up a VLAN with RadminVPN
   RadminVPN is a pretty simple program with no extra components. Download the installer from the official website and install RadminVPN. Click on the red button. The connection status should change to “Online”. After which the program will offer to create a virtual local network or join an existing one. In both cases, you will need to enter the Network Name and Password. When you and your farm colleagues will appear in the same VPN. They will be able to see the "local" server you created in the game.
   
   
   If RadminVPN endlessly tries to connect, try changing the DNS server address in the Network connections Properties using IP version 4. This happened to me, and this method helped me.

In order to get all the achievements you need at least 3 additional players or twinks. But this is only for one achievement "It Takes Two" (Duel 2vs2).
2 additional players/twinks are required only for the achievements "Two for One" (kill two with one hit), "Gang up" (2vs1 duel) and "Against the Odds" (1vs2 duel). For other online achievements, one additional player is enough.


0% Achievement Padawan
Complete a Tutorial in the main menu.

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Touchy Feely
Break the enemy's grab. Use a grab while enemy is trying to grab you. Got it during the tutorial.

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Be Mine
Due on February 14th. Use the "Heart" animation by pressing the C key. You can read by changing the time on your computer. I got it in a match with a bot.

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The following achievements do not work with bots. You need real players.

Honorable
Use bow 100 times (B key). According to some reports, this needs to be done in a row.
You have to bow every match. And this match needs to be finished one way or another. You don't have to win the match.
The longest in duration to achieve, but there is a lifehack:
Activate the in-game console by entering "-console" into Steam game launch commands.
Now, when you press F10 in the game, the game console opens.
After you run the game, enter “bind z kill” in the opened console.
Now when you use Z your character kills himself
When playing a duel with a farming partner, you can bow and immediately die to skip the round faster.
To avoid wasting time changing maps, you can increase the duration of the game on the server.
To do this, in the file "...\Program Files (x86)\Steam\steamapps\common\Blade Symphony\berimbau\cfg\server.cfg" change the value of the "mp_timelimit" item to 999.

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Low Blow
Kill a player right after he bows. You must have a full lifebar

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Emotive!
Use an emote right before killing another player.

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THIS IS SPARTA!
Kill an enemy with a grab.

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Bad Sportsmanship
Complete a round with full health and without bowing.

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Have a Seat
Sit on the floor (T key by default) and after that win the match.

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Initiate
Win your first duel.

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Shapeshifter
Win a duel with each character. The character changes in the pause menu or main menu --> Customization. The character will change in the next match.

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Meditative
Win a match on the map "duel_temple".

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Blasphemy!
Win a match on the map "duel_monastery".

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Winter is Coming
Win a match on the map "duel_winter".

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Take it to the Streets
Win a match on the map "duel_district".

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Gang Up
Win a 2vs1 duel on the side of the superior team.
To change the game mode, on the duel map in the pause menu "Play Online" --> "Call Vote" change the mode to 2vs1.

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Against the Odds
Win a 1vs2 match on the side of the inferior team.
To change the game mode, on the duel map in the pause menu "Play Online" --> "Call Vote" change the mode to 1vs2.

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It Takes Two
Win a 2vs2 match. To change the game mode, on the duel map in the pause menu "Play Online" --> "Call Vote" change the mode to 2vs2.

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Consumerism
Win a match on the map "ffa_community".

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Order Among Chaos
In FFA game mode, challenge your opponent to a duel and win.

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My Hero
Win a round in "Hero Mode" as a hero.
To do this, on the FFA map, in the pause menu “Play Online”--> “Call Vote”, select Hero mode. Disable respawn in the settings right away. If you did not appear as a hero, then either restart the server, or find a hero bot on the map and kill him.
To get the achievement you must kill both the other player and the bots.

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Two for One
You need to kill two players with one attack. This is VERY difficult to do due to the moronic game scripts. Hits that usually damage two opponents at once after death of the first enemy cause almost no damage to the second enemy. The most convenient way to get it is in FFA mode without a duel.
Try to find an attack that contains several hits at once. The area slash never worked for me.

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Easy to do with at least one partner.

Disharmonious
In Capture Point mode, be on the losing team.

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Teamwork
In Capture Point mode, be on the winning team.

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IT WAS ALL ME!
In Point Capture mode, capture a control point all by yourself.

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So Close...
In Capture Point mode, play in a draw.
You don't have to capture anything at all and just wait until the end of the match.

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https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3168310399