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