The hard badge is relatively easy if you follow Dedrood's advice... Each round, buy Thrust, Skis, Freaky, Powder, Creativity, and repeat in that order. I had to replay a few times but that does it.
The game was great but the final boss on insane mode was a little disappointing. The only stats that mattered were health and healing which was a departure from my build for the rest of the game. Other than that, very nice.