Here is the full list of all 35 Koi-Koi Japan Hanafuda playing cards achievements.
Collect each variety of postcard.
Defeat opponents from all areas in Collection Mode.
[Multiplayer]Defeat opponent for the first time.
[Multiplayer]Win 10 times.
[Multiplayer]Win 100 times.
[Multiplayer]Earn 20 points or more with 1 Stop.
Complete "Light Five" Yaku.
Complete all Yaku.
Complete "Light Three" Yaku 10 times.
Complete "Light Four" Yaku.
[Multiplayer]Quit Tutorial Mode.
Win 10 times.
Get 10 successive wins.
Complete "Red and Blue Ribbons" Yaku.
Complete "Light Three" Yaku.
Get 5 successive wins.
Complete "Boar, Deer, Butterfly" Yaku 5 times.
Complete "Red Ribbon" Yaku.
Defeat opponent for the first time.
Form 5 Yaku or more in 1 round.
Earn 10 points or more with 1 Stop.
Earn 20 points or more with 1 Stop.
Complete "Blue Ribbon" Yaku.
Complete "Boar, Deer, Butterfly" Yaku.
Complete "Moon and Cup" Yaku.
Call Stop after your opponent calls Koi Koi.
Complete "Rain Light Four" Yaku.
Call Koi Koi, form a new Yaku, and call Stop.
Form 3 Yaku or more in 1 round.
Complete "Cherry Blossom and Cup" Yaku.
Quit Tutorial Mode.
Win 100 times.
Win 500 times.
Complete "Light Four" Yaku 10 times.
Complete "Light Five" Yaku 10 times.