Most of the achievements are level related and don't take more than a couple of hours each to get through.
Be sure to use your time power when you are unsure about whether there are enemies nearby or not.
Always be sure to try and aim for an enemies head and save the game when you think you may face a lot of enemies at once.
When playing online, the best way to score kills is to wait for the enemie to come to you and use the element of surprise to your advantage causing more damage to your opponent without them knowing.
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