This is also a challenge ("The Reviler"). You will need the Kleptomaniac and Evil trait for this achievement. The achievement and challenge need you to complete a total of five other challenges. Those challenges are :
Ahh, Regret (Return a stolen object.)
After you have stolen an object, simply go up to your mailbox and click "Return object". You need a kleptomaniac Sim to steal an object.
How to steal objects:
1.To steal an object it first needs to be night (After 7:00PM and before 6AM)
2.You need to have a kleptomaniac Sim.
3. No one is around to see you do it.
4. Click on the floor near public places like the library and people's homes and the option "Swipe will appear" if you have all of the above it should be blue.
5. You can only swipe three objects a day.
Big Ol' Meanie (Be mean 10 times.)
Just go up to another Sim and keep doing the "Mean" things to them.
Public Enemy (Become enemies with 15 Sims.)
Either go to a Sim and be mean to them and start fights and rinse and repeat another fourteen times, or go to a community lot and do the "Epic Fail" Karma power. This will freak a lot of people out and then just be mean and fight them until you have fifteen enemies. After you are mean to a Sim a new option of fight will appear, click on this option and choose make Nemesis to become enemies with that Sim.
That's My Candy! (Steal candy from a baby 5 times.)
You need the Evil trait to steal candy from a baby. You could start a new Sim family with a Sim with the Evil trait and a baby and simply take that babies candy five times. After you have done this, save so the challenge also saves.
Thief! (Steal 20 things with a kleptomaniac Sim.)
As this states your Sim needs to have the "Kleptomaniac" Trait, after that simple steal objects. See Ahh Regret! to find out how to steal if you need to know.