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