Finally, I've gotten them all! : r/outerwilds

Outer Wilds: Archaeologist Edition

Outer Wilds - Echoes of the Eye DLC Trophy Guide •

Achievements and Trophies - Outer Wilds Guide - IGN

Outer Wilds Achievements @ Gamertag Nation

Weekend Hot Topic: Favourite Trophy or Achievement

Steam Community :: Guide :: Ghosts in the Machine Achievement Guide - Echoes of the Eye

Outer Wilds - Echoes of the Eye on Steam

Problem with Archaeologist achievement : r/outerwilds

Foolproof Guide to Ghosts In The Machine - Outer Wilds Echoes of the Eye Achievements

EOTE *minor* spoiler] Artstation has some images from concept art for the DLC. There are 14 achievements in-game, but 15 on the art-station. Any guesses as to what this achievement would've been