Doom
Mission 1 Collectible Locations

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You can get everything via chapter select at any time. For two of the trophies "Overclocked" & "Argent Fiend" you have to find all Argent Cells and Elite Guards in one campaign playthrough! So make sure you don't miss anything.
All collectibles (except for dolls & data logs) let you upgrade your gear. This makes them an important part of the game. The Praetor Upgrade called "Full View" reveals the collectible locations on the map (except for Secrets). Some are still hard to find because you need to use switches that aren't marked.

The secrets will give you weapon upgrade points. You don't need every single secret to fully upgrade everything. It's okay if you miss a few of those.
As soon as you pick up a collectible it will be saved instantly and you can exit the mission without having to reach the next checkpoint. You don't have to pick it up again when you die.

In chapter select you can see how many collectibles you have found per level. The Data Logs are tracked separately in the "Codex" menu of the pause screen (they aren't tracked in chapter select).

TIMELINE MISSION 1 THE UAC:

#1 - Data Log #1 (A Brief History) - 0:05
#2 - Secret #1 - 0:30
#3 - Collectible #1 (Combat Shotgun Model) - 0:30
#4 - Elite GUard #1 - 0:58
#5 - Secret #2 (CLASSIC DOOM MAP) - 1:31
#6 - Data Log #2 (Welcome to Mars) - 1:57
#7 - Field Drone #1 - 2:21
#8 - Secret #3 - 2:36
#9 - Collectible #2 (Imp Model) - 2:36

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