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