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.
Complete "Light Four" Yaku.
Complete all Yaku.
Complete "Light Three" Yaku 10 times.
Complete "Red and Blue Ribbons" Yaku.
Get 10 successive wins.
Quit Tutorial Mode.
[Multiplayer]Quit Tutorial Mode.
[Multiplayer]Defeat opponent for the first time.
Complete "Boar, Deer, Butterfly" Yaku 5 times.
Complete "Red Ribbon" Yaku.
Win 10 times.
Get 5 successive wins.
Complete "Boar, Deer, Butterfly" Yaku.
Complete "Light Five" Yaku.
Earn 20 points or more with 1 Stop.
Complete "Cherry Blossom and Cup" Yaku.
Call Stop after your opponent calls Koi Koi.
Complete "Blue Ribbon" Yaku.
Form 5 Yaku or more in 1 round.
Defeat opponent for the first time.
Earn 10 points or more with 1 Stop.
Complete "Light Three" Yaku.
Complete "Moon and Cup" Yaku.
Call Koi Koi, form a new Yaku, and call Stop.
Form 3 Yaku or more in 1 round.
Complete "Rain Light Four" Yaku.
Win 100 times.
Win 500 times.
Complete "Light Four" Yaku 10 times.
Complete "Light Five" Yaku 10 times.
[Multiplayer]Win 10 times.
[Multiplayer]Win 100 times.
[Multiplayer]Earn 20 points or more with 1 Stop.