What is the necessary skillnumber anyone would need to do "everything" in the game? I´m just wondering, since it would be rather irrelevant to have, say, 40 Awareness, if the most difficult skillcheck in the game only requires 20 or so. And the same with the other skills. You know, like having 30 in Security, if the most difficult lock in the game only requires 20 or the like.

I´m not terribly concerned about item creation, seeing that I can leave that to other characters who each only need to boost a couple of skills to the max and make the items I need.

Of course, there are skills my main character may need to max, like Repair and Persuade, in order to get the most from dialogue and breaking down items at a workbench. I read somewhere that the Repair skill of the protagonist is used to determine the amount of components gained from breaking down items, no matter which character does the breaking down. Computer Use could probably also be maxed, seeing that it makes spiking a lot less consuming, but that aspect of Computer Use probably wouldn´t be terribly concerning, since I have T3 to produce spikes. And spikes are easily produced at a wokbench.

I´m just interested in knowing the needed amount of skills to pass all locks, disable all mines and the like, and of course also be able to pass all dialogue-options involving skillchecks.

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Ohh... right, I was only looking at the MMO in the (MMO)RPG description there. :o

You don't really need more than 6 stealth as you have those funky stealth generator belts. 11 awareness, I think...and for the other skills you can do most things with 20 across the board (that includes recovering mines rather than just disabling them).
There are some armour pieces that can only be crafted with >20 skills, but you actually don't need awesome armour to beat the game - the various bosses are rather easy, by the time you get to level 28 or so.