Here is the full list of all 12 The Eternal Cylinder achievements.
Disable 3 Witnesses.
Get the trunk mutation from within a Roondaslock.
Transform to all the mutations that exist in the game.
Defeat a Liberator using Mixer Body projectiles.
Make an Onkifurt leave its nest by spraying water into its mouth.
Scare away a Tripobosh or Onogrosh with a smelly surprise.
Frighten a Tonglegroplet using the Deimatic Trunk.
Scare off an Omnogrom by spraying water into its eye.
Process over 100 units of organic ingredients.
Process over 100 units of mineral ingredients.
Scan all creatures using the Analytical Eyes.
Destroy an Exonerator using Mixer Body projectiles.