Here is the full list of all 38 Monster Monpiece achievements.
Won 100 offline battles!
Tokio area cleared!
Okinava area cleared!
Won 70 offline battles!
Fukuruko area cleared!
Your Rub P stock has exceeded 10000!
Got 100 kinds of cards!
50 successful First Crush ♡ rubs!
Ki Outo area cleared!
Triggered extreme love 20 times!
Won 50 offline battles!
Ho Kaido area cleared!
Won 30 offline battles!
Hollowlo area cleared!
Ginuma area cleared!
10 successful First Crush ♡ rubs!
Triggered extreme love!
First successful First Crush ♡ rub!
Performed First Crush ♡ rub!
Won 10 offline battles!
Kunaguva area cleared!
Performed fusion for first time!
Trained for the first time!
Acquired a card for first time!
Won a card battle for the first time!
Won a card battle with 0 damage!
Attacked castle for first time!
Battled for the first time!
Started the game for the first time!
Obtained all the achievements!
Si Ku Ork area cleared!
Got 500 kinds of cards!
100 successful First Crush ♡ rubs!
Irresistible Force
Triggered extreme love 50 times!
Cleared the game!
Triggered extreme love 100 times!
300 successful First Crush ♡ rubs!