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By splitting the scam, the TF2 key likely won't get refunded. Valve will simply see the OP trading the key for nothing (i.e. gift) and not give it back because the OP says he was scammed out of GoG credit.

You have 13 positive feedback, to me that's a green light. As long as there's at least 6-7 positive and no negative, I think it's okay to deal with "low" feedback users.

I'm in the same boat, personally. I have about the same number of reps, but I've traded with a few traders a bunch of times. Prices tend to be so similar that there's not a lot of advantage to shopping around if you're interested in something that's on sale. I'd rather spend an extra Trading Card and trade with someone I already trust.

I see.

Well, OP, you can check him on various rep sites like SR, ST, bp.tf etc. but overall, I'd suggest you to ask him to go first if you're afraid.

He could've earn level 10 to unlock showcase and fill it with shitload of achievements just to look legit.

Usually such scammers have new account (less than 2-3 months), but still.

Because hacking achievements = they don't mean shit in deciding how "legit" he is.
The way the OP said it, he uses achievements as a measure of account worth, so he should naturally check if that worth is not faked.

Looking at one's play time and/or achievements could help decide whether that's a bogus account or one the guy wouldn't risk losing.

Considering that, yeah, tons of achievements unlocked just to make it look like the guy does play on this account might be a way to make this account pass as legit. From that perspective, what he says isn't stupid.

On the other hand, there are better ways to check if the user is to be trusted.