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