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