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