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