"Vague memory" achievement

[huh?]

Could someone please tell me how I unlock the last achievement, "Vague memory"? I;ve tried entering any name that I could think of but I can't manage to get it right. Is there something I'm missing, or is the achievement only known to a certain few?

Thank you in advance!

[Crit Magnet Kirby]

I've yet to find the right name but here are the ones I've tried that yielded no results:
Sasha
Astro
Astrophysics
Andre (Astrophysics' real name)
João (name of the friend "Shine" was dedicated to)
Miku
Hope

[Silo]

I also tried Noir but it didnt work

[DeMii]

tried lain nothing
surly theres something hiddin in plane site

[Silo]

I figured it out. The world is a small place as it turns out. No wonder that Astrophysics hits so hard home for me.

[WaveHolder]

Originally posted by Swagos:

I figured it out. The world is a small place as it turns out. No wonder that Astrophysics hits so hard home for me.

Reveal your secrets ! You wizard of arcane magics !

[War_Criminal]

Originally posted by Swagos:

I figured it out. The world is a small place as it turns out. No wonder that Astrophysics hits so hard home for me.

I tried the n-word but it didnt work, pls tell us

[WaveHolder]

Originally posted by War_Criminal:

Originally posted by Swagos:

I figured it out. The world is a small place as it turns out. No wonder that Astrophysics hits so hard home for me.

I tried the n-word but it didnt work, pls tell us

💀💀💀

[Tokyo]

Still waiting for an answer

[huh?]

please help me ive tried everything

[miku]

Originally posted by Swagos:

I figured it out. The world is a small place as it turns out. No wonder that Astrophysics hits so hard home for me.

was it Cyrillic?

[Monarch]

I tried Frisk and it worked.

[huh?]

Originally posted by Monarch:

I tried Frisk and it worked.

WHAT I TRIED THAT IS IT CASE SENSITIVE

[huh?]

OH MY GOD IT IS CASE SENSITIVE THANK YOU SO MUCH

Originally posted by Monarch:

I tried Frisk and it worked.

[WaveHolder]

Originally posted by Monarch:

I tried Frisk and it worked.

Frisk worked !
How did you figure it out ?

[Monarch]

Originally posted by WaveHolder:

Originally posted by Monarch:

I tried Frisk and it worked.

Frisk worked !
How did you figure it out ?

Astrophysics comment in this very section, the undertale related emoticon to be exact.