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.
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.