Here is the full list of all 26 Pixel Puzzles: Japan achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
All Puzzles Complete!
Tsukubai
Stop The Pop... With A FIsh
Enlightenment Attained
Urabandai Lakes
Gardens of Nijo Palace
Akai Hashi
Himeji Castle Gatehouse
Consciousness Raised
Cherry Blossom Over Water
Butsudan
Temple Lanterns
Hiroshima Castle Gatehouse
Koen
A Mind In Training
Nara Temple Gates
Iwakuni Bridge
Komainu No Enryakuji
Osaka Castle
On The Road To Enlightenment
Torii
Red Temple Of Nara
Komainu No Osaka
Himeji Castle
Pull It OUT!
Zen Garden