PAYDAY 2: CRIMEWAVE EDITION

I've attempted this achievement a few times before finally unlocking it, these are just a few quick pointers that I feel will be helpful.

No guns. The achievement will become void if you use any other weapon than a melee one (I leaned this from personal experience when I got over 150 melee kills and 2/3 pistol kills and it didn't unlock)

The achievement will only unlock upon completion of the day. As there is no real way to tell how many kills you've got in game you'll have to keep a rough count of them yourself, I recommend going to around 60 kills just to give you a comfortable safety net in case any didn't count for whatever reason.

The level I used was the jewellery store heist on normal difficulty, it's cheap to buy the contract for (16,000) and probably the smallest map with the store itself being a great place to recover health if needs be. On normal difficulty you'll only be facing off against the lowest level of swat teams which are simple enough to one shot.

Other than that I'd level up to having the combined tactical vest available to wear and pick a decent damage melee weapon (I used the spear of freedom which killed all enemies in one hit)
The only skill of recommend is the basic level of pumping iron in the enforcer skill tree, which gives you 50% melee damage against non standard enemies,

There isn't much to the tactics themselves other than don't go Rambo charging towards big groups of enemies as they'll still down you pretty quickly. instead slowly pick them off one by one.

Just the final thing is that I did this with bots playing too and can confirm that you can go down and get the achievement too, as long as you do not fire whilst down!

Apologies in advance for the wall of text, I don't do solutions often haha!