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