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