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