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