For me it seems that all achievement you can get for free gives you coal. The achievements for games I’ve bought(Toki Tori and Defense grid, bought them during the summer sale) have given me coupons and a game.
Well I just bought the Polynomial and did its achievement and got coal so I don’t think that’s it :3 .
got a game for free : ) (Bloodbowl: legendary edition)
Wait, what? You can win different language versions of a game?
Anyone want Episode 1 for some coal?
Anyone want Episode Two, Wings of Prey or 50% of Oddworld Stranger’s Wrath?
For free? 
I think there really is a bigger chance to get coal when you do the “free achievements”, it can’t be explained in any other way. I’ve only got coal from those achievements.
Oh, I added another coal to my [post=‘433710’]list[/post], still ain’t trading them.
Depends… how much do ya want?
I’ll take ep2, but that depends if you want anything for it 
Unsurprisingly, I got coal.
AFAIK you cannot trade coal…
So one of today’s achievements requires me to trade something (despite me already trading twice up to now). Does anyone want to trade a piece of coal for a piece of coal just to get the achievement?
Ok,ok,ok, now this is bull****. Did you see the today’s artistic picture - the “Saints Row Claus”?
That is the first BLOODY STRAIGHT HONEST REFERENCE to HALF-LIFE! There is no Half-Life game featured today, why would that lambda be there?
I can do it.
I’m trying to invite you to trade but it seems the servers are running slow and I can’t access my inventory.
Anyone else up for trading virtual lumps of mummified organic waste?
You might want to wait, it’s not doing very well right now.