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