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