Gears of War 2

This guy went through extreme detail including labeled screenshots of where everything is. It only took me about an hour to go back into the game and get all the ones I missed by loading checkpoints on casual. Once you pick up the collectable just load the next checkpoint, you do NOT need to save the game or reach the next checkpoint to get credit for the collectible.

http://tinyurl.com/65ex7j

Credits to the Youtube channel:
Outer Heaven Guides

Timestamps:

Tip of the Spear
Welcome to Delta
0:21 | #1 - The Eagle Newspaper
0:46 | #2 - Ambulance Driver's Log
Desperation
1:29 | #3 - Doctor's Journal - Dr. Nicolette Shannon
1:56 | #4 - Jacinto Medical Center File - Jonathan Harper
2:20 | #5 - COG Letterhead
2:41 | #6 - COG Proclamation
3:07 | #7 - COG Tag - Pvt. Dylan Murphy
Rolling Thunder
3:32 | #8 - Grindlift Notice
3:52 | #9 - Munitions Requisition Report
Roadblocks
4:25 | #10 - Jacinto Sentinel Newspaper
4:47 | #11 - Memorial Inscription
5:06 | #12 - Truck Driver's Notice
5:23 | #13 - COG Tag - Sammy

Denizens
Indigeneous Creatures
5:54 | #14 - Gear's Journal
6:22 | #15 - Kantus Scroll
Disturbing Revelations
6:57 | #16 - Locust Emblem
Sinking Feeling
7:21 | #17 - Ilima City Help Wanted
7:46 | #18 - COG Tag - Pvt. Hank Bissell
Captivity
8:07 | #19 - Stranded's Journal
Intestinal Fortitude
8:39 | #20 - Car Gold Magazine
8:54 | #21 - COG Tag - Ben Carmine

Gathering Storm
Origins
9:22 | #22 - Interoffice Memo - Niles Samson
9:42 | #23 - Memo - Doug Sato
10:08 | #24 - New Hope Medical File - Ruth
Rude Awakening
10:35 | #25 - Doctor's Journal - Dr. Stephanie Zimmer
11:00 | #26 - Captivity Marks
Displacement
11:35 | #27 - Stranded's Journal - Stu

Hive
Priorities
12:13 | #28 - Locust Terminal
Answers
12:43 | #29 - Prisoner's Journal - Jonathan Harper
Hornets' Nest
13:13 | #30 - Locust Jailer Document
13:40 | #31 - Human Finger Necklace
No Turning Back
14:10 | #32 - Locust Calendar
14:35 | #33 - Locust Defense Plan
The Best-laid Plans
15:08 | #34 - Locust Invasion Map
15:52 | #35 - Trinity of Worms Artifact
Royal Inquisition
16:30 | #36 - Locust Tablets

Aftermath
Desperate Stand
17:11 | #37 - COG Recon Report
17:42 | #38 - COG Tag - Sgt. Devon Jackson
Free Parking
18:16 | #39 - Jacinto Sentinel Newspaper
Tenuous Footing
18:45 | #40 - COG Tag - Sgt. Jonathan Harper
19:09 | #41 - Stranded Journal - Russell