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