Gears 5

TL;DR: You have to collect 273/289 components and get all ultimate upgrades. Chapter select on the same save slot should be working (confirmed in the comments. Thanks!)

The ultimate upgrade locations:

Act 2:
1: Flash Freeze (Flash) - Complete all 3 Hollow Storm Locations
2: Seeker (Shock Trap) - Complete all 3 Outsiders Locations (Loot the Safe in North Tower Sub Station)
3: Marked for Death (Pulse) - Complete Condor Crash Site (South - Loot the safe at the end)
4: Brawler (Stim) - Complete Condor Crash Site (North - Loot the safe at the end)

Act 3:
5: Detonator Implant (Hijack) - Complete all 3 Scavenger Locations
6: Slayer (Cloak) - Complete all 3 Waterworks Locations (after you complete your last location, pick up the upgrade from Paduk's Nomad Guy)

Act 4:
7: Deadly Overload (Barrier) - Pick up in chapter 4-1 in the Swarmak fight area

I will post here a full guide for all 90 collectibles, 289 components, 17 relic weapons, 7 Jack ultimate upgrades locations in one video. You need the components, relic weapons and Jack upgrades for another four achievements. (JACKed Up!, Jack of All Trades, Relic Hunter, Relics of the Past)

Timelines:
Act 1 - 42 Collectibles

Act 2 - 152 Collectibles

Act 3 - 187 Collectibles

Act 4 - 20 Collectibles

In this large! Spoiler are the single Act videos without relic weapons and all upgrades (but I visit all locations, just complete the location and loot the safes / items there)

How about friends, this is my first guide and I apologize for my bad English.
You can get it easy and fast with a friend who already has the achievement, you just have to join it and select Act IV Chapter II and upgrade to Jack and achievement unlocked, so help a friend get it I hope it helps them a lot , you can send me a message if you want to get it and I can gladly help you.
(Only achievement is obtained the components are not saved)

I am posting this because I found the video guides to be less than helpful.
Disclosure #1: 95% of this is based on the Gears of War Fandom Wiki, so due credit to that site. However, I did add or change a few item when I thought the description is unclear or lacking.
Disclosure #2: There is a missing location in ACT II not listing in this guide. However, as noted in other guides you do not need to find every location. My achievement popped halfway through Act IV and I ended with 10 plus extra.

Act I-2
1 - On top of the desk in the Armory
2 - On a crate in front of a locker in the back of the Armory

Act I-3
1 - After fighting off the juvies in the crash, on a desk in an office with black and white tiled flooring
2 - After the Swarmak smashes through the side of the building, upstairs on the desk in the center
3-5 - After the COG soldier shoots at you, downstairs on the right in a box on the wall
6 - In the bathroom directly ahead after finding the civilians
7 - At the park with stairs going down right and left, take the right path, and across the broken bridge. Use Jack to pick it up
8 - At the village square, inside the fruit shop on the left in a box on the wall

Act I-4
1 - In a coffee shop on the left before the fire blocking the path
2 - In a building blocked off by fire to the right after going through the building after the first fire blocking the path. Use stimy to get through the fire
3 - In a truck bed at the loading dock for the hotel. The dock door will need to be opened first
4 - In the laundry room of the hotel, in a box on the wall
5 - In the theater, on a shelf in a storage room right inside the dressing rooms. Use Jack to pick it up
6 - In the theater, on the way out after the stage fight, inside the electrical room in a box on the wall

Act II-1
1-3 - At the beginning of the chapter, down the stairs and inside a shop on the right
4 - In the building opposite the machine shop, on the ground near some blocks of ice
5 - In the building on the other side of the main path from the machine shop to the left of the infirmary, on a shelf to the left of some green crates
6 - After the first set of security gates, on a shelf in the building to the right of the steam machine that explodes
7 - In the store opposite of the home of the facist-calling boy
8 - After the second set of security gates, down the stairs and in the storage room on the left
9 - After the vision, on a shelf in the back of the room on the left with the electrical panels
10 - After the vision, down the stairs, and behind the small meat shack on the right
11-13 - In the room with the shock trap, inside a small side room on the left
14 - In the room with the generator and armory, on the right after entering the armory
15 - In the dark room, in a box on the wall on the right side
16-18 - In the dark room, up the ladder on the left side

Act II-2
1 - Open World
By a destroyed centaur just west of the Old COG Gate 
2 - Open World
At the bottom of the wooden ramp leading to the red shack east of the Train Tunnel
3 - Train Tunnel
In the train car at the end
Flash Upgrade 1 of 3 = Del will assemble once you complete Train Tunnel and both Derrick Sites
4 - Outsider Campsite
In the open on a sheet
Shock-trap Upgrade – 1 of 3= Del will assemble once you collect items from the Outside Campsite and both of the two Substations.

Act II-3
1-3 - After killing the Warden, inside a safe in the basement of the building on the right
4-6 - After falling down a hole, in prison cell filled with poison gas. Use Jack or stim to pick it up
7-9 - After falling down a hole, in a room on the right just before the doors out of the prisons into a morgue

Act III-4
1-3 - Old COG Wall
Inside a box on the wall inside the control room
4-6 - Old COG Wall
Inside a box on the right side pillar outside the second gate
7-9 - Condor Crash Site (Cliff)
Inside a box on the wall of the condor chassis to the right of the path up
10-12 - Condor Crash Site (Cliff)
By the safe at the end of the southern cliffside Condor Crash Site
Pulse upgrade – At first Condor Crash, inside a safe
13 - East Tower Substation
On the ground inside the East Tower Substation to the left of the big screen
Shock-trap Upgrade – 2 of 3= Del will assemble once you collect items from the Outside Campsite and both of the two Substations.
14 - East Comm Tower
Once inside the tower, down the stairs and around to the right, in a corner by the stairs
15 - East Comm Tower
In the second room of the tower, on the right on top of a filing cabinet. Use Jack to pick it up
16-20 - East Comm Tower
In the room with the two disabled turrets, inside a box on the wall down the stairs and around to the left
21 - Open World
By two pieces of a Condor's chasis, southwest of the eastern Old Derrick Site
Flash Upgrade 2 of 3 = Up the ladder to the top of the grindlift to find inside a box on the side
22-24 - North Tower Substation
Inside a box on the wall outside the left side of the substation
25 - North Tower Substation
On the floor inside the substation, opposite the big screen
Shock-trap Upgrade – 3 of 3= Del will assemble once you collect items from the Outside Campsite and both of the two Substations.
26-28 - North Comm Tower
Inside a safe in the crashed condor on the way to the tower
29-31 - North Comm Tower
Inside a safe to the right of the entrance to the tower, surrounded by rejects
32 - North Comm Tower
Inside a box on the wall in the small room to the left after entering the tower
33-35 - Open World
Behind the drill by the corpse to the left just outside of the entrance to the western Old Derrick Site
36-38 - Old Derrick Site (East)
Behind a pair of breakable ice pillars to the left of the grindlift with the ladder
Flash Upgrade 3 of 3 = Up the ladder to the top of the grindlift to find inside a box on the side
39 - Condor Crash Site (North)
At the entrance, right of the dirt path at the start, leading to the northern Condor Crash Site, take a right up the snowy hill, and look to the left by the open pod, you exit near there when you return
40-42 - Condor Crash Site (North)
On the main path of the northern Condor Crash Site near a pod that spawns a Shephard
Stim upgrade – At North Condor Crash, inside a safe that the Kestrel crash exposes.
43 - Condor Crash Site (North)
On the exit path of the northern Condor Crash Site, on the left before dropping down
44 - Open World
In the snow on the west side of a cylindrical storage tank overlooking the cliff north of the Abandoned Mine
45 - Open World
In the snow on the north side of the cylindrical storage tank just outside of the entrance to the Abandoned Mine 
46 - Abandoned Mine
In the yellow train car blocking the tunnel on the way to the mine
47-51 - Abandoned Mine
After lifting the gate to enter the mine, inside a safe in the room to the right
52-54 - Abandoned Mine
After opening a double door into a room with lots of pods, inside a box on the wall in the room to the left


Act II-5
Location
1-5 - After the first vision at the gates to the Kadar Facility, inside a box on the wall in the room with a generator to the left of the main entrance
6 - In the room with the cryo jets, on a desk in the room on the way to the generator
7-11 - In the room with the cryo jets, in a box on the wall in the room on the right
12 - In the room with the "unstable specimens", on a desk up the ramp
13-15 - In the second room with malfuctioning cryo jets, on a shelf
16 - On a shelf to the right of Niles' corpse
17-21 - After the matriarch makes her first appearance, destroy the iced locust across the hole to reveal the components, and then pick them up with Jack

Act III-1
1 - Abandoned Airport
On a desk in the small office directly ahead at the start of the chapter
2 - Abandoned Airport
After going down the stairs at the start of the chapter, on the keyboard of a computer on the desk straight ahead 
3-5 - Abandoned Airport
Before talking to Baird, follow the sign pointing to Passport/Baggage Claim, and head right into a small room. Look on top of a shelf to the left, and use Jack to pick them up
6 - Abandoned Airport
To the right of Baird, below a partially disassembled Sentinel
7-9 - Abandoned Airport
To the right of the Hijack testing area
10-12 - Abandoned Airport
On the way to Paduk, go straight past the exit into a room and look inside a box on the wall on the left
13 - Abandoned Airport
After exiting the airport to talk to Paduk, head left, and on a table to the left
14-18 - Abandoned Airport
Behind the tent Paduk is sitting in front of, inside a locked safe
19-21 - Abandoned Airport
Inside the Abandoned Airport zone in a box on the wall on the left side of Hangar 1
22-26 - Open World
Outside the Abandoned Airport zone in a box on the wall on the right side of second Hangar 3
27 - Open World
On the other side of the road from the hangars outside the Abandoned Airport zone, by the sandbags blocking the road
28 - Open World
Southeast of the Abandoned Airport against the south map bounds, by a dead UIR soldier next to a car
29-31 - Water Tower
Behind the building the Nomad in, in a box on the wall
32 - Water Tower
Up the ladder on the side of the building the Nomad in, across a gap in the ramps. Use Jack to pick it up
Cloak Upgrade 1 of 3 = Nomad will provide once you complete Water Tower, Pump Station, Harbor Docks missions
33-37 - Open World
South of the Water Tower and Southwest of the Cosmonaut Training Facility against the south map bounds, by some DeeBee pods
38 - Cosmonaut Training Facility
At the entrance to the zone, follow the path left around the crashed tank off the dirt path, on the groun by some chassis pieces
39-41 - Cosmonaut Training Facility
Before entering the Cosmonaut Training Facility through the double doors, in a box on the wall to the right of the hole in the wall when facing away from the doors
42 - Cosmonaut Training Facility
After entering the Cosmonaut Training Facility through the double doors, on the left after heading down a bit. Use Jack to pick them up
43-45 - Cosmonaut Training Facility
After sliding down a short ramp, to the left through a metal detector/security checkpoint
46-50 - Cosmonaut Training Facility
After opening the shutters, proceed down the corridor, in a room on the right inside a locked safe
51-53 - Cosmonaut Training Facility
After wiping clean the swarm assholes in the corridor fight against a scion with a bastion, in a room on the right full of space suits in a box on the wall in the back
54-58 - Cosmonaut Training Facility
After dropping down from the section with the cranes, through the locked door on the right breaking a lock on a door, in a box on the wall
59-61 - Cosmonaut Training Facility
After ducking under some DeeBees, by some DeeBee pods on the left on the path forwards
62 - Cosmonaut Training Facility
After securing the beacon, go past the double doors to the next area, on a table at the end of a short hallway
63-67 - Cosmonaut Training Facility
After securing the beacon, go past the double doors to the next area, in the dark room on the right in a box on the wall
68-70 - Nomad Convoy
At the end of the convoy at the opening of a yellow crate
(Does not spawn until after the Hammer of Dawn targeting beacons are retrieved and one returns to get Jack's Shield upgrade)
71-75 - Open World
West of the Pump Station against the north map bounds, underneath the slightly open gate in the barricade wall
76-78 - Open World
Northeast of the entrance to the Pump Station, between two cars
79 - Pump Station
To the right of the control panel, on top of a crate
Cloak Upgrade 2 of 3 = Nomad will provide once you complete Water Tower, Pump Station, Harbor Docks missions
80-82 - Open World
On the northwest side of the support pillare of the bridge between the Pump Station and City Ruins, inside a box on the wall.
83-85 - Open World
Northwest of the City Ruins, inside the buildings against the wall
Hijack Upgrade- Part 1 of 3 = Final hall wall in City Ruins, on table at start of straight shoot to exit.
86-88 - City Ruins
In the final room before leaving the City Ruins, inside a box on the wall to the left of the entrance
89-91 - Open World
West of Harbor Docks, underneath 3 yellow pipes inside a box on the wall
92 - Harbor Docks
On the eastern ship, towards the northeast on top of a support pillar
93 - Harbor Docks
South of the western sunken ship, on a wooden ship platform
Cloak Upgrade 3 of 3 = Nomad will provide once you complete Water Tower, Pump Station, Harbor Docks missions
94-98 - Open World
South of Harbor Docks, between 3 broken down UIR Pariah tanks
99-103 - Open World
Just south of the gate on the UIR wall on the west side, inside a box on the wall
104-106 - Open World
South of the Rocket Hangar, on the east side of a lone gun battery, inside a box on the wall


Act III-2
1-3 - Rocket Hangar
Technically before the start of Chapter 2 - after the turrets, when the door marked A03 leading into the Rocket Hangar and the start of chapter 2 comes into view, turn right onto the tilted platform and follow the path to a box on the wall
4 - Rocket Hangar
At the start of Chapter 2, follow the stairs on the left down, back up, and then to the right behind the sandbags
5-7 - Rocket Hangar
After opening the shutters in the command center and entering the actual rocket hangar, down the stairs to the right and straight ahead in a box on the wall
8-10 - Rocket Hangar
After opening the shutters in the command center and entering the actual rocket hangar, down the stairs to the right, swing around to the right, and to the right of the twin silver pipes in a box on the wall
11-13 - Rocket Hangar
After travelling across the chasm in the gantry, follow the path left before the door to the end to a box on the wall
14-16 - Rocket Hangar
After a small encounter with drones and a hunter, but before the doors to the facility, follow the path to the right, leading to some crates on a catwalk above the door
17-19 - Rocket Hangar
In the corridor with the turret, in a side room near the turret, in a box on the wall
20-22 - Rocket Hangar
After sliding down a ramp and going under some rubble into a big room, head straight forward and left at the dead UIR soldier, follow the path to some sandbags, and then inside a box on the wall
23-25 - Rocket Hangar
In the dark corridor where Kait asks Jack for light, follow the path passing the lit up room, on the fllor behind the sandbags
26-28 - Rocket Hangar
After fighting the carrier, in the room with the lift, up the stairs and in the back to the right in a box on the wall
29-31 - Train Turntable
Inside the control room, in a box on the wall

Act III-3
1-3 - Artillery Battery
Inside the control room on the top floor, in a box on the wall
Hijack Upgrade- 2 of 3 - 2nd floor of the Artillery Battery on the ctr table
4 - Open World
North of the Cargo Shipwreck, by a disassembled Shepherd
5-7 - Cargo Shipwreck
Below the stairs at the end of the Cargo Shipwreck by a disassembled Shepherd
Hijack Upgrade- 3 of 3 – Cargo Shipwreck at the top of the stairs by a dead nomad
8 - Open World
Directly behind the Crashed Condor site by some crates, one can see the marking flag from it, back of the fuselage
9 - Open World
Directly west of the Crashed Condor site by some crates, smallest debris pile
10 - Open World
Directly northwest of the Crashed Condor site on top of a crate inside some Condor chassis debris, next to a tri-shot
(DR-1s will attack)
11-15 - Crashed Condor
Inside a locked safe in the Crashed Condor

Act IV-1
Location
1 - At the very start of the chapter, turn around and go back into the building, and look on the ground behind some crates on the left
2-4 -After being lifted by Cole, on a desk to the right
Barrier Upgrade- When you enter the basement and see the Swarmak, go right toward the corner back by some ammo.
5-9 - After killing the Swarmak, continue towards the Tomb of the Unknowns until a rusted blue van. Turn right at the van towards a dead end road, and then hop over the barricade on the right
10-12 - In the section with the Rejects, look for a path downwards. Hop over the two train rails at the bottom, and then look on the ground. Alternatively, after killing the Stump, head back to the entrance to the Stump's area and look for the path down
13-15- After witnessing the flocks flying by, the components can be seen on a ledge next to a tree and van