A Plague Tale: Requiem

A Plague Tale: Requiem contains 43 total collectibles, spread amongst the 17 chapters. They are as follows:
- 21 Souvenirs
- 5 Flowers
- 7 Feathers
- 10 Secret Chests

Collectibles can be done in your first playthrough, or by using Chapter Select or Scene Select. Your collectibles progress is also displayed during these menus. Additionally, the use of Invincible Mode is allowed, and can help make mop-op even faster.
0:00 - Intro

Chapter 1: Under a New Sun
0:45 - Perfect Shot: Shoot all Pine Cones (Part 1)

Chapter 2: Newcomers
2:22 - Souvenir 1: Best Player (Part 1)
3:35 - Souvenir 2: Be at Peace (Part 4)
4:19 - Flower 1: Arrowhead (Part 7)

Chapter 3: A Burden of Blood
4:52 - Souvenir 3: A Grave (Part 4)
5:40 - Flower 2: Chamomile (Part 5)
6:18 - Secret Chest 1 (Part 8)
7:10 - Souvenir 4: Our Home (Part 8)

Chapter 4: Protector’s Duty
7:50 - Flower 3: Gentian (Part 2)
8:26 - Souvenir 5: Silk Treasure (Part 2)
9:27 - Secret Chest 2 (Part 3)
10:23 - Souvenir 6: A Grain of Sand (Part 4)
11:06 - Mercy Achievement/Trophy (Part 5)

Chapter 5: In Our Wake
12:25 - Souvenir 7: The Stag’s Roar (Part 1)
13:03 - Souvenir 8: HUUUUGOOOOO! (Part 1)
14:04 - Secret Chest 3 (Part 3)
14:48 - Flower 4: Anemone (Part 3)

Chapter 6: Leaving All Behind
15:59 - Feather 1: Jay (Part 1)
16:47 - Souvenir 9: Imagine You’re Flying! (Part 2)
17:50 - Secret Chest 4 (Part 5)
18:39 - Souvenir 10: Which Colour Do You Want? (Part 5)

Chapter 7: Felons
19:32 - Feather 2: Black Headed Gull (Part 1)
20:10 - Souvenir 11: The Survivor
20:49 - Secret Chest 5 (Part 3)
21:40 - Souvenir 12: The First Men

Chapter 8: A Sea of Promises
22:37 - Souvenir 13: Saint Lucinda (Part 2)
23:23 - Feather 3: Black Kite (Part 2)
24:02 - Perfect Throws Achievement/Trophy & Souvenir 14: Flower Crown (Part 2)

Chapter 9: Tales and Revelations
25:14 - Souvenir 15: A Thousand More Years (Part 2)
26:21 - Secret Chest 6 & Souvenir 16: Nice Screeching (Part 2)
28:45 - Souvenir 17: Tramontane (Part 3)
30:17 - Secret Chest 7 (Part 3)
31:02 - Feather 4: Barn Owl (Part 4)
32:25 - Old Protector Achievement/Trophy: Interact with all old protector items in sanctuary (Part 6)

Chapter 10: Bloodline
39:15 - Feather 5: Raven (Part 4)
40:36 - Souvenir 18: A Rag Doll (Part 5)
41:27 - Secret Chest 8 (Part 6)

Chapter 11: The Cradle of Centuries
42:08 - Feather 6: European Goldfinch (Part 4)
42:51 - Souvenir 19: The Chateau D'Ombrage (Part 5)
43:44 - Souvenir 20: His Toys (Part 6)
44:19 - Secret Chest 9 (Part 7)

Chapter 12: The Life We Deserve
No Collectibles

Chapter 13: Nothing Left
45:07 - Souvenir 21: A Mess (Part 1)
46:00 - Feather 7: Greylag Goose (Part 4)
47:23 - Secret Chest 10 (Part 4)

Chapter 14: Healing our Wounds
No Collectibles

Chapter 15: Dying Sun
No Collectibles

Chapter 16: King Hugo
48:03 - Flower 5: Carnation (Part 1)

Chapter 17:
No Collectibles

Find 7 feathers to unlock this achievement.

Chapter 6 -
Sub-Chapter - Towards the sea
Feather: Jay (19:11)

Chapter 7 -
Sub-Chapter - Arrival at the beach
Feather: Black headed gull (27:51)

Chapter 8 -
Sub-Chapter - Celebration of the brighter days
Feather: Black kite (33:23)

Chapter 9 -
Sub-Chapter - Entering the sanctuary
Feather: Barn owl (51:40)

Chapter 10 -
Sub-Chapter - The old temple
Feather: Raven (1:01:15)

Chapter 11 -
Sub-Chapter - Byzantine technology
Feather: European goldfinch (1:05:45)

Chapter 13 -
Sub-Chapter - Ruined village
Feather: Greylag goose (1:14:28)

Hi All

There are 7 feathers to be found in the game. They can be found in chapters 6, 7, 8, 9, 10, 11 and 13. From the chapter select menu you can see what you are missing in that chapter, the feathers go down as 7 of 12 Hugo's Herbarium collectables.


Time stamps:

00:00:00 - Intro
00:01:02 - Chapter 1 - Perfect Shot Achievement/Trophy
00:03:47 - Chapter 2 - Souvenir 1
00:05:28 - Chapter 2 - Souvenir 2
00:06:26 - Chapter 2 - Flower 1
00:06:57 - Chapter 3 - Souvenir 3
00:07:46 - Chapter 3 - Flower 2
00:08:25 - Chapter 3 - Souvenir 4
00:09:37 - Chapter 3 - Chest 1
00:10:21 - Chapter 4 - Flower 3
00:10:49 - Chapter 4 - Souvenir 5
00:12:16 - Chapter 4 - Chest 2
00:13:27 - Chapter 4 - Souvenir 6
00:14:37 - Chapter 4 - Mercy Achievement/Trophy
00:16:03 - Chapter 5 - Souvenir 7
00:17:15 - Chapter 5 - Souvenir 8
00:18:41 - Chapter 5 - Chest 3
00:19:26 - Chapter 5 - Flower 4
00:20:46 - Chapter 6 - Feather 1
00:22:39 - Chapter 6 - Souvenir 9
00:24:07 - Chapter 6 - Chest 4
00:24:53 - Chapter 6 - Souvenir 10
00:26:05 - Chapter 7 - Feather 2
00:26:56 - Chapter 7 - Souvenir 11
00:28:06 - Chapter 7 - Chest 5
00:28:41 - Chapter 7 - Souvenir 12
00:29:55 - Chapter 8 - Souvenir 13
00:31:16 - Chapter 8 - Feather 3
00:32:32 - Chapter 8 - Souvenir 14 and Perfect Throw Achievement/Trophy
00:34:21 - Chapter 9 - Souvenir 15
00:35:41 - Chapter 9 - Souvenir 16
00:39:08 - Chapter 9 - Chest 6
00:39:40 - Chapter 9 - Souvenir 17
00:41:51 - Chapter 9 - Chest 7
00:42:53 - Chapter 9 - Feather 4
00:43:46 - Chapter 9 - Old Protector
00:51:50 - Chapter 10 - Feather 5
00:52:46 - Chapter 10 - Souvenir 18
00:54:33 - Chapter 10 - Chest 8
00:56:25 - Chapter 11 - Feather 6
00:57:10 - Chapter 11 - Souvenir 19
00:59:32 - Chapter 11 - Souvenir 20
01:00:27 - Chapter 11 - Chest 9
01:01:13 - Chapter 13 - Souvenir 21
01:03:10 - Chapter 13 - Feather 7
01:04:27 - Chapter 13 - Chest 10
01:04:54 - Chapter 16 - Flower 5

Bit late to the party but here's my collectibles guide. This includes all Flowers, Feathers, Souvenirs, Secret Chests, Knives & Tools. Fully narrated, timestamped and includes guidance on missable story achievements when nearby.

There is a total of 7 Feathers. Found in the following chapters.
Jay: Chapter 6 - Towards the sea
Black Headed Gull: Chapter 7 - Arrival at the beach
Black Kite: Chapter 8 - Celebration of the brighter days
Barn Owl: Chapter 9 - Entering the sanctuary
Raven: Chapter 10 - The old temple
European Goldfinch: Chapter 11 - Byzantine technology
Greylag Goose: Chapter 13 - Ruined village

As someone who's not a fan of video guides for collectibles, I'm sure I'm not alone. Below will be every Souvenir, Flower, Feather, and Secret Chest in the game, as well as enough knives so that you can open all the chests. Knife locations are based on Narrative difficulty, higher difficulties have less knives, and there are more knives in game than listed below. Be sure not to use any knives on enemies as you need them for the chests, and they're single use only. Note that if you don't have the upgrade to carry more knives, you won't be able to unlock the second chest in Chapter 9. I'll also list all the miscellaneous achievements as well so you know where to find them.

Chapter 1 - Perfect Shot achievement
Perfect Shot achievement - When you reach the river, hit all the pinecones that are sent your way. 7 will come by themselves, then after a short break another 15 will come down in pairs.

Chapter 2 - 2 Souvenirs, 1 Flower, 1 Knife
Souvenir 1 (Best Player) - Towards the start of the level you will pass through a market. Afterwards, you will have a quick stop at a flower stall before being able to continue. Take a right at the junction with the fish stall to find a shooting gallery game to play. Finish the game by throwing 4 pots to get the souvenir.
Knife - After using the cage on a cart to climb a wall, grab the knife after going up the stairs from a board before going through a gap.
Souvenir 2 (Be at Peace) - After being introuduced to the skill menu, follow the path to some steps, and follow them round to the right. At the end will be a woman lying in a bed. Speak to her for the souvenir.
Flower (Arrowhead) - After returning outside after the elevator, go through a vegetable patch and a flower will be pointed out, interact with it to pick it up.

Chapter 3 - 2 Souvenirs, 1 Flower, 1 Secret Chest
Souvenir 1 (A Grave) - After leaving the city, follow the path round to the right to find a fenced garden with a locked gate. Head to the right and look at the back of the gate, shoot the lock off, then enter the garden and interact with the grave.
Flower (Chamomile) - After passing through a gap in a wall and arriving in an area with a large tree in the middle, go behind the tree and look at the branches to see a pot. Hit the pot down and interact with the flower.
Secret Chest - After picking your equipment up, open up the chest directly behind you with the red cloth on it.
Souvenir 2 (Our Home) - After picking up your equipment, use you sling to knock a plank down on the second level near where you dropped down to the ground floor. Climb the ladder and cross the plank then interact with the map.

Chapter 4 - 2 Souvenirs, 1 Flower, 1 Knife, 1 Secret Chest, Mercy Achievement
Flower (Gentian) - After leaving the tunnel towards the start of the level, head to the right and at the end of the path pick up the purple flower.
Souvenir 1 (Silk treasure) - Before dropping down a trap door, turn around and go through a gap in the wall. Use the cart to climb up the wall with the white paint, then interact with the yellow silk.
Knife - After going through the trap door, run forwards to grab the knife from the crates up ahead.
Secret Chest - When you're able to move a cart with a brazier on it, light the brazier and look for a ladder to climb. Push the cart towards it and climb the ladder to find the chest.
Souvenir 2 (A Grain of Sand) - After leaving the room with the tar pits, follow the path until you need to go through a gap in the wall, but before doing so use your sling to hit a chain between some wood opposite the gap. Follow the new path to the end and interact with the plank of wood.
Mercy Achievement - After lowering the second platform as part of the tar puzzle, throw some tar at the torch being carried and run up the stairs to the left and through the door.

Chapter 5 - 2 Souvenirs, 1 Flower, 1 Secret Chest, 3 Knives
Souvenir 1 (The Stag's Roar)- From the start of the level, follow the path until you reach a path branching off to the right with a chest (if you get to the gap in the wall you've gone too far, back track a little bit). Go to the left of the chest and follow the path to a red material in a tree.
Souvenir 2 (Huuuugoooo!) & Knife - After dealing with all the cranes and before the workbench, look for a ladder you can knock down. Climb it and follow the path, then head to the left for an interaction. There is a knife on a barrel here too.
Secret Chest - After crossing the river and shooting a weight in a building, go behind the building and through a gap. Climb the ladder and open the chest.
Knife - After opening the chest, look for a pile logs next to the river, the knife is embedded in one of the logs.
Flower (Anemone) - When you've made your way on the lower part of the bridge, use your sling to hit a chain next to the cliff. Use the nearby cart to climb up to the plank you just knocked down, then follow the path up the cliff to get the flower.
Knife - There's another knife in a fallen tree after getting the next weapon

Chapter 6 - 2 Souvenirs, 1 Feather, 1 Secret Chest, 1 Knife
Feather (Jay) - Next to a large tree at the start of the level, you will be directed to it.
Souvenir 1 (Imagine You're Flying!) - After passing three tents on the left hand side under a red awning, look to the left for a path that leads to a swing, interact with the swing.
Knife - In the second area after learning a new ability, there is a knife in a cart to the right of a crawl space.
Secret Chest - After passing through a large open area and entering a large brick building you will see the chest behind some metal bars. Go under the shelving to the right to access the chest.
Souvenir 2 (Which Colour do you Want?) - After learning another new ability and passing through the room, climb the ladder in a small room, crawl through a gap and drop down into another small room, then interact with the small cloth strips.

Chapter 7 - 2 Souvenirs, 1 Feather, 1 Secret Chest, 1 Knife
Knife - After charging through some birds, enter a hut on the left and pick up the knife from the bedding.
Feather (Black Headed Gull) - After picking up the knife, jump through the window of the hut and follow the path to the end, the feather is on the ground.
Souvenir 1 (The Survivor)- After leaving the (first) cave, head to the shipwreck on the left and go up the path behind it, then interact with the boat.
Secret Chest - Whilst passing through a small cave system, look to the right of an alcove with a torch and a crack in the wall, there will be another ship wreck. Crawl through the gap in the shipwreck to find the chest.
Souvenir 2 (The First Men) - After passing through a crack in the wall and emerging near a lighthouse, turn left and climb up the wall, crawl into the cave and grab the torch. Follow the cave to the end and interact with the wall.

Chapter 8 - 2 Souvenir, 1 Feather, Perfect Throw achievement
Souvenir 1 (Silent Lucinda) - After entering the market, head to the right and take the second path on the right. Make your way to the goats and interact with the fence.
Feather (Black Kite) - Head across the market from the goats towards a palm tree, then take a right past a group of people to a tree up some stone steps. The feather is under the tree.
Perfect Throw achievement - After leaving the market, keep an eye out for some steps to your left. Head down to find a stall with four flower rings and take part in the game. You'll need to throw a pot through each of the rings, aim for the top of the ring first, then slightly down so the arc appears and the pot will go through the holes.
Souvenir 2 (Flower Crown) - Complete the flower ring game above.

Chapter 9 - 3 Souvenirs, 1 Feather, 2 Secret Chests, 1 Knife, Old Protector achievement
Knife - From the first bird statue, follow the path down the hill, taking a left at the large pond and follow the left path all the way to a tower. Go round the left side of the tower and fire your sling through a gap to unlock a door. Climb up the ledge at the front of the tower and open the door, then look left on the inside for the knife.
Secret Chest 1 - Climb the ladder round the corner from the knife, then a second ladder to find the chest.
Souvenir 1 (Nice Screeching!) - From the chest, climb one more ladder and interact with the wall over looking the ocean. Afterwards return to the bird statue.
Souvenir 2 (A Thousand More Years) - After the second bird statue, go through a gap in a stone wall on the right, and follow the path to the end and interact with the tree here.
Souvenir 3 (Tramontane) - After turning left at a locked gate, continue up to a destroyed brick building and burn the grass next to the door. Interact with the gap next to the door, then interact with the goat inside.
Secret Chest 2 - Continue a short way past the last Souvenir and look out for a ledge on your left. Climb up it for the chest.
Feather (Barn Owl) - Climb all the way up to the top of the ruined tower after getting past the guards outside, and you'll be overlooking an area with a red tent. Don't drop down, follow the path to the feather.
Old Protector achievement - After a cutscene where you're directed to a door, head through it and interact with the following items; A large white tent, a rocking horse next to the entry door, a bed, and some wooden dolls to the left of the closed door. In the next room interact with a box to the right as you enter, a chest to the left of the second door, a weapon rack, and a suit of Armour. There's nothing through the next door except a small scene, then go through the next door. In this room, interact with the black powder on the floor to the right of the door, some jars in the corner further down, the instrument in the next corner round, a black pot behind a white cloth, and the furnace opposite the door you entered from. Afterwards go to the middle of the room and interact with the table. Follow the path upstairs and interact with the large grate on the floor and finally the scrolls in the corner.
*Note - If you didn't get the second chest, replay the Chapter from the start, pick up the knife again, and rush through to where the second chest is. You can return to the main menu after picking up the chest.

Chapter 10 - 1 Souvenir, 1 Feather, 1 Secret Chest, 1 Knife
Knife - After dropping down a hole and climbing up some stairs there will be a building on your right with an archer on the roof. The knife is next to the archer.
Feather (Raven) - After breaking down a door, follow the path until you see a gap on the left. Take this path down to the sea and at the end will be the feather.
Souvenir (A Rag Doll) - After a short jog across a field and a couple of brief conversations you will enter a brick building. Interact with the wooden post to the left and shoot the wall opposite. Go to where you shot, climb up, and interact with the tree to the right.
Secret Chest - When standing on top of a cage on a cart, light the fire closest to you, then after a brief interaction, light another fire towards the corner of the fortress. Make your way across and into the tower and up the stairs to the chest.

Chapter 11 - 2 Souvenirs, 1 Feather, 1 Secret Chest, 1 Knife
Feather (European Goldfinch) - After first using a barrel to remove a doorway, go to the back right corner in the next room to find another barrel behind some wooden planks. Shoot the barrel and crawl through the gap for the feather.
Knife - After destroying a second door, go right at the first junction and pick up the knife from a skeleton against the left wall.
Souvenir 1 (The Chateau d'Ombrage) - In the room with the cart puzzle, push the right most cart forwards, left, then right. When at the end of the tracks, use tar on it and drop of to the right hand side to interact with some maps. Use tar on the cart to climb back up.
Souvenir 2 (His Toys...) - In the room after clearing the cart puzzle, look to the right wall for a door with a red cloth next to it. Interact with the hole next to it, then go through the door and interact with the table.
Secret Chest - After raising the second broken bridge piece, don't drop down after going through the chains. Instead go left through another set of chains to find the chest.

Chapter 12 - None

Chapter 13 - 1 Souvenir, 1 Feather, 1 Secret Chest, 1 Knife
Souvenir (A Mess) - After moving a crate out of the way to open a path forward, jump over a small wooden barricade and look right to find a larger crate to move. Do so, crawl through the hole and interact with the table.
Knife - When you drop from a building and reach a large flower arch, turn around and go round the corner to the right to find a knife in a post.
Feather (Greylag Goose) - When you have to move the first cart to progress, instead of placing it under the wooden platform, place it next to the wall. Climb up and grab the feather in front of you.
Secret Chest - From the feather, turn right, go through the door and open the chest.

Chapter 14 - None
Chapter 15 - None

Chapter 16 - 1 Flower
Flower (Carnation) - At the start of the level, this will be pointed out to you before going through the first door.

Chapter 17 - None