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