Here is the full list of all 42 Lies of P achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Find out about the last story of Geppetto.
[Real boy: They all lived happily ever after] Reach the ending.
Find out about the last story of Sophia.
[Rise of P] Reach the ending.
Decipher all cryptic vessels and claim the rewards.
Collect and play all records.
Find out about the last story of Eugénie.
Collect all special weapons.
Play a perfect tune on the piano at Hotel Krat.
[Free from the puppet string] Reach the ending.
Kill the Nameless Puppet.
Find out about the last story of Simon Manus.
Kill the Awakened God Simon Manus.
Learn all gestures.
Collect all normal weapons.
Kill Laxasia the Complete.
Find out about the last story of Antonia.
Discover all Trinity Sanctums.
Find out about the last story of Venigni.
Kill the Black Rabbit Brotherhood.
Strengthen a special weapon to its max level.
Strengthen a normal weapon to its max level.
Collect all Legion Arms.
Kill the Corrupted Parade Master.
Activate P-Organ to Phase 5.
Kill the Puppet-Devouring Green Monster.
Kill Champion Victor.
Modify a Legion Arm to its max level.
Kill Romeo, King of Puppets.
Kill all types of Dimensional Butterflies.
Destroy an enemy’s weapon with a perfect guard.
Harvest Gold Coin Fruit.
Kill the Eldest of the Black Rabbit Brotherhood.
Kill the Fallen Archbishop Andreus.
Try to assemble a weapon.
Kill the Scrapped Watchman.
Kill King’s Flame, Fuoco.
Kill a Stalker.
Tell a lie in front of Hotel Krat Entrance.
Kill the Parade Master.
Repair a Stargazer.
Deliver a successful Fatal Attack.