Here is the full list of all 31 TOKOYO: The Tower of Perpetuity achievements.
Collect 101 log pieces
Reach the summit three days in a row
Defeat Lula of the Dark Star
View ending with Kukuri
Defeat Riim the Irreversible End
Get your blood sucked by a Vampire 5 times
Collect 50 log pieces
Achieve 20 bonus score chains
Achieve 10 bonus score chains
View ending with Imibi
Reach the summit two days in a row
Get hugged by a Succubus 5 times
View ending with Kanae
Collect 25 log pieces
Get hugged by a Maid Succubus 5 times
Reach maximum karma
View ending with Shippo
Defeat the Immortal Nanaha
View the ending with Cocoa
Climb 250 floors
Collect 10 log pieces
Defeat the Demon Queen Erloa
Climb 100 floors
Reach the Unknown Hopeless Area
Climb 50 floors
Climb 25 floors
Reach the Light Danger Area
Reach the Danger Area
Reach the Absolute Danger Area
Reach the Hopeless Area
Achieve 5 bonus score chains