To get the hard badge, play through the game twice. The first time, collect all the lightning bolts and die all you want. Always touch checkpoints, so dying won't affect you. Just finish the level with all 3 lightning bolts. Unlock the fan levels, which gives you 8 bonus levels. These are the levels you shouldn't try to get 0 deaths: 42, 47, 53, ~70, 71, 74, 76, ~78. (70 and 78 are doable, but not as impossible as the rest). The rest can be done with little raging, because levels become 10 times easier when you're not trying to get lightning bolts.
I liked how in the other Ducklife, the minigames got faster, so I could get more EXP and coins faster. This just starts slow, and stays slow for the rest of the game.
Thank you for your comments, can be done so that the accuracy of sight increases from level to level?