Here is the full list of all 50 Wolfenstein: The New Order achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Unlock stealth perk 5
Solve the fourth Enigma code
Solve the third Enigma code
Collect 25 gold items
Solve the second Enigma code
Solve the first Enigma code
Choose to save Wyatt
Complete game on any difficulty
Complete game on I AM DEATH INCARNATE! (or ÜBER)
Release friend
Defeat the London Monitor
Unlock stealth perk 8
Locate the underwater stash
Unlock demolition perk 2
Find the Laserkraftwerk
Unlock stealth perk 7
Locate the resistance
Unlock stealth perk 2
Unlock stealth perk 1
Choose to save Fergus
Unlock demolition perk 1
Save allied planes
Complete game on ÜBER
Collect all gold items
Collect all letters
Unlock stealth perk 3
Unlock stealth perk 4
Unlock stealth perk 6
Unlock tactical perk 1
Unlock tactical perk 2
Unlock tactical perk 3
Unlock tactical perk 4
Unlock tactical perk 5
Unlock tactical perk 6
Unlock tactical perk 7
Unlock tactical perk 8
Unlock assault perk 1
Unlock assault perk 2
Unlock assault perk 3
Unlock assault perk 4
Unlock assault perk 5
Unlock assault perk 6
Unlock assault perk 7
Unlock assault perk 8
Unlock demolition perk 3
Unlock demolition perk 4
Unlock demolition perk 5
Unlock demolition perk 6
Unlock demolition perk 7
Unlock demolition perk 8