Here is the full list of all 15 Orebody: Binder's Tale achievements.
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Defeated the Observer mid-boss
Finished Stracildom Forest
Finished The Great Sea Solorus
Defeated Faraday the Blademaster
Finished The City of Veralin
Defeated Cyclotron the Fury
Defeated Heimholtz the Spark Priest
Finished Mount Nebesa Gora
You killed a friend
Defeated Shear the Deathbringer
Finished the Floating City of Galvanstad
Finish Boss Rush Mode
Finish the game on Advanced Mode
You tried out the jukebox mode