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