How to get the rarest achievement in the game

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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