Well, about the normal solution:
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× The lemming at (18,5) must press the pp, the other lemming must be blocked...
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× this means that you'll need the help of the bent-tail lemming to get out of the chamber, but also the help of the roach.
About the challenge description, the lemming at (14,5) must do all the route he can do, which means that he needs to arrive at (14,27). Then you have to clear the room and you'll get the challenge.
A hint for the challenge it's the name of the challenge itself:
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× "blorx's golem"
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× Also. the bent-tail lemming is useful for the challenge
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There's not some other world out there where everything's gonna be okay.
There's just this one, just this rock.
-33th Skywatcher