Here is the full list of all 15 MY HERO ULTRA RUMBLE achievements.
K.O. 300 opponents in total in Ranked Matches.
Send 10,000 Likes in total.
Reach Player Level 50.
Obtain 50 Emblems.
Purchase an item at the Shop 100 times in total. (Purchasing multiple items at once only counts for 1 time.)
Reach Pro rank.
Reach Amateur rank.
Create a "My Banner"
Complete the Tutorial. (Can be achieved even if Tutorial is skipped.)
Become Champion 100 times in total in Ranked Matches.
Obtain 1,000,000 Gold in total.
Obtain 1,000,000 Agency Points in total.
Unlock 10 Illustrations in the Gallery.
Obtain 1,000 ★ in Missions in total.
Get the highest rating 200 times in total in Ranked Match results.