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