Guild Wars 2

I didn’t find any info about this, but it looks like a hidden room and item possibly? I know it’s not affecting achievements like it doesn’t count for bachelor of secrets or master of enchantments.
So question is, how to open these door, and what does fist with arrow down mean?

It means use the power glove. The level 1 power glove only breaks wood however, so you can assume that that’s future content.

And that down arrow is a P in New Krytan.

So it’s future content. Makes sense as it’s not listed in the achievement list of upgrades :P

Ok now it make sense, thanks for clearing things up!