Here is the full list of all 22 Pachi Pachi On A Roll achievements.
Completely undress Robin (Casino)
Completely undress Robin (Western)
Completely undress Robin (Sci-Fi)
Completely undress Robin (Medieval)
Completely undress Fujiko (Casino)
Completely undress Fujiko (Western)
Completely undress Fujiko (Sci-Fi)
Completely undress Fujiko (Medieval)
Obtain your first 1.000.000 points
Pass all Casino missions
Pass all Western missions
Pass all Sci-Fi missions
Pass all Medieval missions
Enable all Spin Light
Obtain a jackpot in roulette
Open the mini game in Western world
Open the mini game in Sci-Fi world
Open the mini game in Medieval world
Unlock level Western
Unlock level Sci-Fi
Unlock level Medieval
Combo level Max