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.
Stop The Pop... With A FIsh
All Puzzles Complete!
Tsukubai
Enlightenment Attained
Akai Hashi
Gardens of Nijo Palace
Himeji Castle Gatehouse
Hiroshima Castle Gatehouse
Consciousness Raised
Temple Lanterns
Butsudan
Cherry Blossom Over Water
Koen
Nara Temple Gates
A Mind In Training
Iwakuni Bridge
Komainu No Enryakuji
Osaka Castle
Torii
On The Road To Enlightenment
Red Temple Of Nara
Urabandai Lakes
Himeji Castle
Komainu No Osaka
Zen Garden
Pull It OUT!