Here is the full list of all 38 Zero Escape: The Nonary Games achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Gained all trophies.
Found ALL the files in VLR!
Caught a glimpse of another time.
Saw the end. Or maybe the beginning?
Saw Phi's ending in VLR.
Escaped from sixteen rooms in VLR.
Escaped everything on Hard difficulty in VLR.
Found ALL the secrets in VLR!
Opened the tenth lock in VLR.
Opened the eighth lock in VLR.
Opened the ninth lock in VLR.
Saw Luna's ending in VLR.
Saw Quark's ending in VLR.
Opened the third lock in VLR.
Saw Sigma's ending in VLR.
Opened the seventh lock in VLR.
Opened the sixth lock in VLR.
Saw any of the bad endings.
Saw Alice's ending in VLR.
Opened the fifth lock in VLR.
Opened the fourth lock in VLR.
Saw K's ending in VLR.
Opened the first lock in VLR.
Saw Dio's ending in VLR.
Escaped from eight rooms in VLR.
Saw Clover's ending in VLR.
Saw any of the endings in VLR.
Saw Tenmyouji's ending in VLR.
Opened the second lock in VLR.
Escaped on Hard difficulty in VLR.
Gained all Memories of Escape in 999.
Saw the Submarine ending in 999.
Saw the Knife ending in 999.
Finished all scenarios in 999.
Solved the final question in 999.
Saw the Ax ending in 999.
Saw all previews in 999.
Saw the Zero Lost ending in 999.