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