There is a total of 17 Gestures. My guide is an edit/improvement from Powerpyx. Below I have linked the list created by Powerpyx -
https://www.powerpyx.com/lies-of-p-all-gesture-locations/Important Note - Gestures 6, 7, 8, 11, 13, and 14 are missable! But you can get the ones you may have missed in New Game+. If the achievement doesn't unlock in NG+ when you obtain the missing gestures, according to
OrakioRob you can get the missing Gestures with a new save, which can unlock the achievement.
There will be the "Broken Puppet" NPC next to the Barren Swamp Stargazer. He will give you a Quart when you show him Gestures 10 (Clap), 11 (Sad), 15 (Anger) , and 16 (Happy)
Krat Central Station1. Sit: Available from the start.
2. Check Ground: Available from the start.
Hotel Krat3. Show Off Clothes: when you reach Hotel Krat for the very first time, speak to Antonia.
Elysion Boulevard Entrance4. Remembrance: shortly after the start of the area, you will find two puppets throwing electric bombs. Continue along the next few rooftops until you can see a ladder on your right. Get up to the rooftops and kill the two puppets, then carefully drop down the hole at the end of the second rooftop. Kill another puppet and exit the room on your left, then left again to enter another room with a white couch. Collect the Frozen Man’s Letter, then open the Collectibles menu (Letters) and read it.
Workshop Union Culvert5. Stalker’s Promise: when you meet the Red Fox and Black Cat for the first time, go up the stairs right of them and continue through the rooms until you can find a hole in the floor. Drop down and defeat the Survivor.
Venigni Works Control Room -
Missable 6. Fear: obtained for talking to Venigni when you first meet him near the Stargazer. (Before beating King's Flame, Fuoco)
Hotel Krat -
Missable 7. Swagger: exhaust all possible dialogs with Venigni after defeating King’s Flame, Fuoco. WARNING: there are reports of this Gesture being missable if you don’t talk to Venigni immediately after returning to Hotel Krat after defeating King’s Flame, Fuoco.
St. Frangelico Cathedral Library -
Missable 8. Pray: when you first reach St. Frangelico Cathedral Library, talk to Sister Cecile in the room left of the Stargazer. Collect the Holy Mark you can fine on a table by a side room with a safe, then return to her. Now proceed to defeat Fallen Archbishop Andreus, then return to Cecile’s location to get Cecile’s Written Confession. Open the Collectibles menu (Letters) and read it. WARNING: this Gesture is missable if you don’t return the Archbishop’s Holy Mark to Cecile BEFORE fighting Fallen Archbishop Andreus.
Malum District Town Hall9. Taunt: obtained for defeating The Eldest of the Black Rabbit Brotherhood main boss.
Hotel Krat10. Clap: obtained for returning the Portrait of a Boy inside the Black Rabbit Brotherhood’s hideout after defeating the Eldest.
Rosa Isabelle Street Culvert -
Missable 11. Sad: obtained for completing Julian the Gentleman’s side quest. You can find Julian the Gentleman next to the Stargazer. Talk to him and accept his quest to retrieve her wife’s belongings. Later on, once you reach Rosa Isabelle Street proper, you’ll be able to collect the quest item needed to complete the side quest (it’s in your path, hard to miss). Then, return to Julian choose “I saw the message she left, saying she loves you” to lie.
WARNING: This Gesture is missable if you tell Julian the truth. Must be obtained during the Lie playthrough.
Grand Exhibition Gallery12. Respect: after defeating Champion Victor and obtaining the Saintess of Mercy Hall Key from Simon Manus, retrace your steps and take a right down the stairs to go back to the greenhouse. Then, open the gate to access the Statue and unlock this Gesture.
Grand Exhibition Conference Room Missable 13. Beg: return to the Stargazer and continue on. Eventually, you’ll reunite with the Red Fox and the Black Cat. Talk to them and they will be asking for some Gold Coin Fruit. Give it to them and you’ll unlock this Gesture.
Hotel Krat -
Missable 14. Greet: after defeating the Puppet-Devouring Green Monster of the Swamp, return to Hotel Krat and speak with Antonia to obtain this Gesture. WARNING: this Gesture is missable and can only be obtained if you had Giangio craft the medicine for Antonia after defeating Champion Victor and telling Polendina that he should give the medicine to her.
Hotel Krat15. Anger: obtained for speaking with Antonia after defeating Corrupted Parade Master.
Arche Abbey Outer Wall16. Happy: you’ll eventually reach a room with two narrow beams in the middle. Continue to the bottom floor and ride down the elevator past the traps to find Test Subject 826. Talk to him to obtain this Gesture.
Ascension Bridge17. Entreat: after defeating Laxasia The Complete, enter Sophia’s bedroom and talk to her. You will obtain this Gesture after the conversation with her.
Video Guide by FayMoon -