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