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