The "Fight at the Museum" level is perfect for this achievement. You don't really have enemies to fight under you get to the boss fight. Use Black Adam, because when you get hit, your hearts regenerate, so run around to get them back. You get the pop after the last scene.
Also, I'm not sure if this would work because I didn't try it, but alternatively, if you're struggling with it (I doubt it because playing as Black Adam is like playing on easy mode), you can play as Superman since he's invincible. Or if you've beaten the game you can slap invincibility on your created character.
If this is yout first time through, you'll also unlock: