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