Here is the full list of all 70 Mighty No. 9 achievements.
Complete any stage without using a ReXelection or missing an attack.
Complete any stage without taking damage.
Complete any stage without using healing items.
Defeated a boss with 1% or less health on Beck.
Drop 100m without touching anything.
Ascend 100m without touching anything.
Complete any stage by dashing only 9 times or less.
Complete the Water Plant stage without being frozen.
Complete any stage by jumping only 30 times or less.
Maintain ability boosts for 60 seconds in any stage.
Complete the City stage without taking damage.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 2 boss battle.
Achieve an S rank result.
Get 50 100% Absorption combos in a row.
Get 40 100% Absorption combos in a row.
Get 30 100% Absorption combos in a row.
Attack and absorb enemies 5 times in the air before landing.
Achieve an A rank or higher and 100% Xel absorption rate result.
Don't attack for the first 30 seconds of a boss battle.
Achieve all FINE PLAY! technical bonuses in the Opening Stage boss battle.
Defeat all bosses with only normal attacks.
Complete the game on NORMAL difficulty.
Get more than 10 game overs in your play lifetime.
Complete a stage with Call.
Achieve all FINE PLAY! technical bonuses in the Prison boss battle.
Defeat all Mighty Numbers with only normal attacks.
Complete 8 main stages and rescue all Mighty Numbers.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 8 boss battle.
Complete any stage with just a single death.
Score 100,000 points in total.
Get 20 100% Absorption combos in a row.
Get 10 100% Absorption combos in a row.
Activate all ability boosts at the same time.
Defeat any Mighty Number without letting them heal.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 1 boss battle.
Get 5 100% Absorption combos in a row.
Get 3 100% Absorption combos in a row.
Score 10,000 points in total.
Complete the opening stage.
Achieve a WONDERFUL! technical bonus.
Complete the game on HARD difficulty.
Complete the game on HYPER difficulty.
Complete the game without restarting on HARD difficulty.
Complete every SPRINTER! technical bonus.
Complete every AMAZING! technical bonus.
Complete every QUICK CLEAR! And NICE CLEAR! technical bonus.
Complete the game within 120 minutes.
Complete the game within 60 minutes.
Witness every helping event by Mighty Numbers.
Complete any stage with a 100% absorption rate.
Complete the Factory stage within 9 minutes with all transformations.
Complete any stage with Beck's feet touching the ground for no more than 1 second.
Complete any stage without pressing normal movement inputs for longer than 1 sec. at a time.
Complete any stage without absorption combos or technical bonuses.
Beat the final boss with zero lives remaining and low health.
Get defeated by a boss at less than 10% health.
Complete Mighty No. 9 on the 9th.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 3 boss battle.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 4 boss battle.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 5 boss battle.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 6 boss battle.
Achieve all FINE PLAY! technical bonuses in the Mighty No. 7 boss battle.
Achieve all FINE PLAY! technical bonuses in the Robot Factory boss battle.
Achieve all FINE PLAY! technical bonuses in the Last Stage boss battle.
Score 1,000,000 points in total.
Defeat Mighty No. 5 before he detonates his special attack.
Attack the final boss with every single Mighty Number ability.
Complete all themes in single-player Challenge Mode.
Complete Boss Rush Mode for the first time.
Complete Boss Rush Mode in less than 20 minutes.