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