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