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Gain a medal on a Survival map, using melee weapons only. Make sure to do this one first because if you already have a medal on a map, this won't work.
This achievement is bugged for many people, but If you still want to try it out, you should try doing it on Dead Center, Chapter : Mall Atrium. You CAN do it with bots or friends, they are allowed to use guns. Here's a video showing the easiest way to do it.

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Firstly, you need to download and install these workshop items: Left 4 Fun and Left 4 Fun Sample Mods

Afterwards you have to create a Survival lobby, start a Local Server and choose a map you have not yet got a medal on. When the game loads type in these command in chat in this order before moving:

• !l4f_admin_init
  
• !settings mod l4f_meleeonly_nospecial
  
• !incap all

Then the game will restart. Pick up your melee weapon and play until you reach bronze, and it should pop up.
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If the commands don't work, use these provided by Raven:

!l4f settings mod l4f_meleeonly_nospecial
!l4f incap all
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A huge thank you to 腐烂的 M u S h for coming up with this fix!

This is an excerpt from my Left 4 Dead 2 100% achievement guide. Check it out here!
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2419666451

If I helped you, don't forget to upvote/favorite.


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