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