Full list of all 12 Wolfenstein 3D achievements worth 200 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox 360.
Get 100% kills on any floor on Don't Hurt Me or harder
Exit any floor at any difficulty
Find one secret
Complete episode one on Don't Hurt Me or harder
Complete episode two on Don't Hurt Me or harder
Complete episode three on Don't Hurt Me or harder
Complete episode four on Don't Hurt Me or harder
Complete episode five on Don't Hurt Me or harder
Complete episode six on Don't Hurt Me or harder
Get 100% of the treasure in any floor
Complete one floor on "I Am Death Incarnate"
Complete all six episodes on Bring 'Em On! or harder