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Hands of Doom achievement in Dead Rising 2: Off The Record

In order to unlock new skill moves, you need to level up (so you will probably get this while just playing the game). I'm not going to put a list here because you can just check your status while in game. But I will say this, the last skill move (Disembowel) unlocked for me at Level 47. I believe it is random what level skill moves unlock on but for me, I got the achievement after reaching Level 47.

just by saving all survivors and doing all missions my first play through, i reached well over level 40. playing a second play though reaching level 50 should be pretty easy.