Here is the full list of all 50 Kill The Bad Guy achievements.
Make the Bad Guy watch 50 movies
Make the Bad Guy read 50 magazines
Kill 10 Bodyguards
Cut off 50 legs
Kill 5 Bodyguards
Kill a Bodyguard
Kill 25 innocent bystanders
Spill 500 liters of blood
Kill 5 cops
Kill 10 innocent bystanders
Kill one cop
Kill the Bad Guy 25 times on the same level
Kill the Bad Guy 35 times as he's escaping
Make the Bad Guy run away 25 times
Fail 50 times
Finish Level DNKTBG
Finish Level Zombies!
Cut off 15 heads
Dismember the Bad Guy 50 times
Cut off 5 heads
Broadcast a game on Twitch TV
Share one image on Facebook
Kill the Bad Guy over several days
Associate 100 items
Cut off 10 legs
Fling the Bad Guy 1000 meters away
Make a pedestrian stop in front of a porn item 25 times
Get 60 teeth
Make the Bad Guy run away 10 times
Spend 2 hours playing the game
Fail 10 times
Kill one innocent bystander
Kill the Bad Guy 50 times
Get 60 passports
Kill the Bad Guy 25 times
Spill 100 liters of blood
Put a dog on a catapult
Kill the Bad Guy 5 times as he's escaping
Kill the Bad Guy 5 times on the same level
Keep hold of the ball for 5 seconds
Kill the Bad Guy in one day
Commit your first assassination
Make the Bad Guy run away for the first time
Start the game
Associate 1000 items
Make the Bad Guy run 5000 meters
Kill the Bad Guy 250 times
Spend 35 hours playing the game
Get 396 stars
Finish Level T666