There are a total of 132 collectibles in Wolfenstein: The New Order – 50 gold items, 72 Enigma codes, 10 letters. You must find all collectibles to unlock the following 7 trophies/achievements:
All that glitters [Bronze / 20G]
Heart of Gold [Silver / 30G]
The Lives of Others [Bronze / 30G]
Secrets Revealed I [Silver / 30G]
Secrets Revealed II [Silver / 30G]
Secrets Revealed III [Silver / 30G]
Secrets Revealed IV [Silver / 30G]

None of the collectibles can be missed! You can search for missing items at any time during the story or after completing the story via the chapter select. It also doesn't matter which timeline you are playing in (Fergus/Wyatt). The only difference between the timelines is that you can either pick locks or hack circuits, but the levels are the same and collectibles are not affected.
Stealth kill commanders will mark some collectible locations with a question mark on your map (press to open map). However, this will not necessarily unlock all locations. There are areas where there is no commander, or you will have to complete small side quests to be rewarded with an item.
As soon as you pick up a collectible, it is saved immediately. You don't have to reach the next checkpoint. Even if you start a completely new game, your collection progress will be carried over.

In the chapter select you can see how many collectibles you have found per level. Each collectible has its own name, making it easier to identify what you are missing. To see the names, open the Collectors menu during a mission.

Wolfenstein The New Order Trading Card Playlist:
http://www.youtube.com/playlist?listPLRr5L69yg_kGYlFq73YrFegHFoa31gjOY

TIMELINE CHAPTER 2:
#1 – Enigma Code #8 (piece 1:8) – 0:00
#2 – Letter No. 2 (Izabela’s letter) – 0:29
#3 – Gold Item No. 6 (Golden Hood Ornament) – 1:02

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All trophies and achievements from Wolfenstein: The New Order:

gunner
Save Allied aircraft

Fergus saved
Decide to save Fergus

Wyatt saved
Decide to save Wyatt

Long live the resistance!
Find the resistance

Full power for the laser
Find the Laser Power Plant

Hidden in the depths
Find the underwater supply

Uprising in London
Defeat the London Monitor

liberation
Share friend

liberation
Complete the game on any difficulty level

superhero
Complete the game on I AM DEATH INCARNATE! (or OVER)

About hero
Full game on OVER

Everything that glitters
Collect 25 gold items.
http://www.youtube.com/playlist?listPLRr5L69yg_kGYlFq73YrFegHFoa31gjOY

heart of gold
Collect all gold items
http://www.youtube.com/playlist?listPLRr5L69yg_kGYlFq73YrFegHFoa31gjOY

The Lives of Others
Collect all letters
http://www.youtube.com/playlist?listPLRr5L69yg_kGYlFq73YrFegHFoa31gjOY

Secrets Revealed I
Solve the first Enigma code.
http://www.youtube.com/watch?vUDRNNCL17G8

Secrets Revealed II
Solve the second Enigma code.
http://www.youtube.com/watch?vndGJlPNVpls

Secrets Revealed III
Solve the third Enigma code.
http://www.youtube.com/watch?vWoEG5y_hAUc

Secrets Revealed IV
Solve the fourth Enigma code.
http://www.youtube.com/watch?vSJeTH21Gofs

Scout I
Unlock Stealth Perk 1

Knife throwing
Unlock Stealth Perk 2

Knife sheath
Unlock Stealth Perk 3

Knife sheath
Unlock Stealth Perk 4

Quiet shot
Unlock Stealth Perk 5

vampire
Unlock Stealth Perk 6

Scout II
Unlock Stealth Perk 7

Assassin
Unlock Stealth Perk 8

sniper
Unlock Tactical Advantage 1

Quick drawing
Unlock Tactical Advantage 2

Fast regeneration
Unlock Tactical Advantage 3

Weapon magazine
Unlock Tactical Advantage 4

Shotgun magazine
Unlock Tactical Advantage 5

AR Magazine
Unlock Tactical Advantage 6

Marksman Magazine
Unlock Tactical Advantage 7

Fast reloading
Unlock Tactical Advantage 8

Double reloading
Unlock Attack Advantage 1

Endurance I
Unlock Attack Advantage 2

Scavenger
Unlock Attack Advantage 3

Bullet feed
Unlock Attack Advantage 4

Endurance II
Unlock Attack Advantage 5

Car armor
Unlock Attack Advantage 6

Truck battery
Unlock Attack Advantage 7

Expert in two-handed combat
Unlock Attack Advantage 8

Relapse
Unlock Demolition Perk 1

Grenade Pouch
Unlock Demolition Perk 2

Grenade Pouch
Unlock Demolition Perk 3

Bull's eye
Unlock Demolition Perk 4

Rocket magazine
Unlock Demolition Perk 5

Evaporate
Unlock Demolition Perk 6

Guardian
Unlock Demolition Perk 7

Hardened
Unlock Demolition Perk 8

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