Here is the full list of all 50 Wolfenstein: The Old Blood achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Achieve gold medal for this challenge map
Collect 64 gold items
Complete all nightmare levels
Complete the nightmare boss level
Complete the nightmare in chapter 5
Collect all letters
Complete the prologue nightmare
Unlock the Armor upgrade II perk
Unlock the Quick turn perk
Complete the nightmare in chapter 2
Unlock the Kampfpistole ammo storage upgrade perk
Unlock the Eagle Eye perk
Complete the nightmare in chapter 1
Unlock the Ammunition upgrade perk
Unlock the Carry heavy machinegun perk
Complete the nightmare in chapter 7
Complete the nightmare in chapter 3
Choose to save Annette
Complete game on any difficulty
Complete game on I AM DEATH INCARNATE! (or ÜBER)
Complete game on ÜBER
Collect 32 gold items
Unlock the Grenade belt perk
Choose to save Kessler
Complete the nightmare in chapter 6
Unlock the Schockhammer clip upgrade perk
Unlock the Tough Skin perk
Collect 5 letters
Complete part one
Unlock the Health upgrade III perk
Unlock the Health upgrade II perk
Collect 16 gold items
Complete the nightmare in chapter 4
Unlock the Reload mash perk
Escape Castle Wolfenstein
Unlock the Bombenschuss clip upgrade perk
Unlock the Armor upgrade I perk
Unlock the Health upgrade I perk
Collect 8 gold items
Unlock the Vampire perk
Infiltrate Castle Wolfenstein