Here is the full list of all 15 Orebody: Binder's Tale achievements.
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Finished Stracildom Forest
Defeated the Observer mid-boss
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