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