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