Unmechanical Extended Nothing but Net Achievement Guide
Here's a text instruction from my good friend Maxen13 if you're still having trouble.
There's a large cavern with a furnace (oven) and the coal pieces are scattered around. There are six in total and look like large black rocks embedded into the walls. You will need bombs to dislodge them.
For this achievement, holding a piece of coal begin below the furnace. Then fly upwards and slightly right and release the coal when you are almost (but not quite) level with the furnace edge. The coal should arc upwards and fall in, hopefully with three seconds airtime.
The achievement is "nothing but net" but my piece of coal hit the rim and went in and the achievement still popped.
You can see his guide on TrueAchievements at www,http://bit.ly/15MtEQ9
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