Here is the full list of all 17 RUKIMIN's Disappointing Adventure! ~SHOBOMI AND THE PHANTOM RUINS~ achievements.
Falling walls hold secrets.
Clear with less than 5 deaths
Completed faster than 10 minutes.
Game over on the title screen.
Beat BLOCK KING! ver2.0
Died 100 times
Completed the mission.
Finished the tutorial.
Meet a PRINCESS BELL!
Game over on the game select scene.
Died 50 times
Returned to the starting point.
Eat rice balls
Beat BLOCK KING!
Died 10 times
Died once.
Overflowing from the screen.