Here is the full list of all 50 Bayonetta achievements. It takes around 35-40 hours to unlock all of the achievements on Windows.
Engage Witch Time successfully 10 times.
Complete the Vestibule.
Defeat Fortitudo on any difficulty.
Defeat Temperantia on any difficulty.
Defeat Iustitia on any difficulty.
Defeat Sapientia on any difficulty.
Defeat Father Balder on any difficulty.
Complete all Chapters on any difficulty.
Complete Chapters 1 through 4 on Normal difficulty.
Complete Chapters 5 through 7 on Normal difficulty.
Complete Chapters 8 through 11 on Normal difficulty.
Complete Chapters 12 and 13 on Normal difficulty.
Complete Chapters 14 through the Epilogue on Normal difficulty.
Complete all Chapters on Normal difficulty.
Complete Chapters 1 through 4 on Hard difficulty.
Complete Chapters 5 through 7 on Hard difficulty.
Complete Chapters 8 through 11 on Hard difficulty.
Complete Chapters 12 and 13 on Hard difficulty.
Complete Chapters 14 through the Epilogue on Hard difficulty.
Complete all Chapters on Hard difficulty.
Complete all Chapters on ∞ Climax difficulty.
Execute a Torture Attack.
Execute 50 Torture Attacks.
Engage Witch Time successfully 10 times consecutively.
Earn 10 Platinum Medals. Must be earned in 10 different battles.
Create 20 Concoctions.
Kill an enemy by jumping on top of them.
Avert 10 enemy attacks with the Moon of Mahaa-Kalaa equipped.
Counter 10 enemy attacks with the Moon of Mahaa-Kalaa equipped.
Counter three enemy attacks consecutively with the Moon of Mahaa-Kalaa equipped.
Taunt and defeat five plus angered enemies while taking no damage. Gaze of Despair may be equipped.
Execute a Wicked Weave attack while using Dodge Offset.
Execute 20 Wicked Weave attacks while using Dodge Offset.
Kill 20 enemies using only Iai-Jutsu with Shuraba. (Iai-Jutsu performed by holding the Y button.)
While never setting foot on the ground, grab enemies 10 times using Kulshedra.
Freeze 20 enemies while wearing Odette.
Purchase three new techniques.
Purchase all techniques.
Obtain three complete Angelic Hymn Gold LPs.
Obtain seven complete Angelic Hymn Gold LPs.
Discover half of all the Umbra Witches' final resting places.
Discover all of the Umbra Witches' final resting places.
Discover all Alfheim portals.
Complete half of all Alfheim portals.
Complete all Alfheim portals.
Collect all of Antonio's Notes.
Destroy all the tentacles that drop down together during in single sequence in Chapter 9.
Defend Cereza during the out of body experience, ensuring she takes no damage.
Earn Platinum Medals during Verse 1 and Verse 2 of Chapter 14.
Dodge the runaway streetcar during Chapter 2.