Step 1
Unequip all weapons from one hand
Step 2
Find some weak enemies that appear in large numbers
Step 3
Smash your mouse button corresponding to mr.RIggs' hand without any weapons
Step 4
Do that again until you kill 500 enemies
Epilogue
Enjoy your achevement that is SO HARD that only 2.8% of players completed
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=2746156740
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