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