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