Warhammer 40,000: Space Marine 2

You must perform 50 unique executions. The two things to consider are 1. enemy type and 2. the melee weapon you are using. Different melee weapons cause different animations on different enemies. You will want to mix up the melee weapon you are using and should not have any issues unlocking this. One extra thing to note is that bosses also seem to have their own unique animation so if you are not sure what weapon you missed one on going back to execute bosses might help you out. I got this without ever using the hammer so apparently there are enough of them it should not cause a big headache for most people.

Not a guide but rather a psa.
Due to us gamers being the game testers we have again been hosed by the industry we support.
My trackers for the x amount of x to do chievos have quit tracking after quitting to main menu once a chepoint was reached. Turning game off and then playing mp once started my console back k up later. My 20k and 41 k kills chievo along with all other tracking chievos have stopped tracking.
I suspect this is along the same lines as a Pillars of Eterninty when paradox released it in that the game ONLY tracked chievos as long as the system was not shut off. Once it was shut off and rebooted at another time hievos were locked and no longer tracked.
Be careful