This is a very simple but missable achievement. When you return from the slums after killing Torg-9 and speak to gene, an orange box will appear above his stomach you will have an option to stab him. Do it. If you do not do this at this moment, the opportunity will never arise again.

This will not impact the story of the game in any way and he will not die. Gene will quickly heal himself and be annoyed momentarily annoyed at you. The player will simply have a short new dialogue and acquire the achievement.

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