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