Here is the full list of all 19 GoNNER achievements.
You became Death.
There's nothing there! No easter egg, no extra item, no nothing. Just a dumb achievement.
You completed Death world! Woah!
you found sally
These combos are just getting ridiculous...
You completed Shooty world! Smooth!
I believe in you, get back up.
You hit the glyph cap!
You completed the Robot world. Impressive.
You pushed that big piece of trash off your lawn. Good on you.
I'm a serious adult person and I think this kind of humor is childish and should be banned.
You completed the Cave world. Good job.
You got a combo of 15!
You jumped on 20 enemies in a row
It's not even ASCII, how can it even be called Roguelike???
You got a combo of 5
You picked up a glyph!
Didn't have to skip death.
Did you just run out of colors?