Here is the full list of all 9 rote² achievements.
The base game contains 4 achievements, and there is 1 DLC pack containing 5 achievements.
Launch the game
Clear all easy levels in Default Pack vol.1.
Clear all normal levels in Default Pack vol.1.
Clear all hard levels in Default Pack vol.1.
Clear all normal levels in Default Pack vol.2.
Clear all hard levels in Default Pack vol.2.