I already know what you're asking : "isn't this what 26/26 is?". And, well, yes it is certainly the closest to it, but there's actually some of the cyan letters left out. Should there be an extra category for all endings/masteries/letters as well?
Something to add here that should be mentionned : the Newgrounds Launcher at the start to every new game you have to exit the launcher and go back in (the timer says 0:00 in the menu and the elephant is still in the same starting position as normal so this should still count), if you don't, the save & exit button will just not work bc game has alot of bugs lol
@Vapo these 3 achievements do work for me (I use the Newgrounds launcher and I don't play in fullscreen so I can obtain them). I actually could (and did finish) 2 100% runs as of writing this