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 demolition perk 5
Unlock assault perk 7
Complete game on I AM DEATH INCARNATE! (or ÜBER)
Complete game on ÜBER
Unlock assault perk 6
Solve the fourth Enigma code
Solve the third Enigma code
Collect all gold items
Collect all letters
Solve the second Enigma code
Collect 25 gold items
Solve the first Enigma code
Unlock assault perk 8
Unlock stealth perk 8
Unlock demolition perk 4
Unlock stealth perk 6
Unlock stealth perk 4
Unlock demolition perk 7
Unlock demolition perk 6
Choose to save Wyatt
Unlock demolition perk 8
Unlock demolition perk 3
Complete game on any difficulty
Release friend
Unlock assault perk 5
Defeat the London Monitor
Unlock demolition perk 2
Unlock stealth perk 3
Unlock stealth perk 7
Unlock tactical perk 8
Unlock assault perk 4
Unlock tactical perk 7
Unlock stealth perk 5
Locate the underwater stash
Unlock tactical perk 5
Unlock assault perk 3
Unlock tactical perk 6
Unlock tactical perk 4
Find the Laserkraftwerk
Unlock tactical perk 3
Unlock assault perk 2
Locate the resistance
Unlock stealth perk 2
Unlock tactical perk 2
Unlock stealth perk 1
Unlock demolition perk 1
Choose to save Fergus
Unlock assault perk 1
Unlock tactical perk 1
Save allied planes